The AI Files · Donald Trump · 2016–2026
On 20 February 2026 the Supreme Court held 6–3 that a 1977 emergency-powers law does not let a president impose tariffs. Steel, aluminum, and China Section 301 duties sit on different statutes. Who pays is a separate fight — and New York Fed economists estimated nearly 90 percent of the 2025 burden fell on U.S. firms and consumers.
This guide keeps proclamations, USTR notices, and the slip opinion on the spine. Rival camps get their own paths: leverage that worked, foreigners who supposedly pay, national-security pretext, and the dissent that would have upheld IEEPA.
Port of Los Angeles containers. Image: Wikimedia Commons · see credit; re-encoded, EXIF stripped
The story
Proclamations and lists first; slogans after.
Chapter 1
Before any proclamation, Congress owns peacetime duties. Article I puts taxes and foreign commerce in the legislature’s hands. That is why every later fight in this file is really a fight about *which statute*, if any, handed a piece of that power to the president. [1] [2]
Chapter 2
Section 232 and Section 301 are not improvisations. One ties import adjustments to a Commerce national-security investigation. The other lets USTR answer foreign practices that burden U.S. commerce — and it knows the word “duties.” IEEPA, written for emergencies, lists many verbs and never says tariff. [3] [4] [5]
Chapter 9
By 2019, Amiti, Redding, and Weinstein’s *Journal of Economic Perspectives* paper reported near-complete pass-through of the new tariffs into U.S. duty-inclusive prices. Foreign exporters, on average, did not eat the tax. [20]
Chapter 14
Back in office, Trump declared drug-trafficking and trade-deficit emergencies and used IEEPA to impose duties on Canada, Mexico, China, and — via “reciprocal” tariffs — trading partners at large. Rates jumped, paused, and stacked; the syllabus notes a brief path toward a 145% combined China hit. [29] [30] [31] [32] [2]
Chapter 15
In February 2026, New York Fed economists estimated that nearly 90 percent of the 2025 tariffs’ economic burden fell on U.S. firms and consumers. Methods and late-year shifts are in the post; the headline still lands on Americans. [33]
Chapter 17
20 February 2026: the Supreme Court holds that IEEPA does not authorize the president to impose tariffs. Roberts writes the judgment; Kagan stresses ordinary statutory tools; Kavanaugh, with Thomas and Alito, dissents. Section 232 and Section 301 are not on the chopping block in that case. [2]
Chapter 19
“Foreign countries pay” fails as incidence. Leverage may still be argued. Pretext on 232 may still be argued. The dissent’s IEEPA reading may still be taught. None of those rival paths gets to launder a false who-pays claim into the mainstream spine. [33] [20] [7]
Chapter 20
Explorer cards hold the FR notices and the slip opinion. Theories show what each major network must remove from the critical path. Memory tracks how the public story moved from trade-war panic to “Biden kept them” to “emergency tariffs struck down.” Start with the path; then argue. [2] [25]
Explore
Pick an era, or search everything at once: entries, people, dated events, claims, theories and media.
Threads
Each thread pulls together the entries on one question, across all the eras.
Key people
Presidents, USTRs, justices, economists, and sector voices.
Donald J. TrumpPresident (2017–21, 2025–)Ordered 232 proclamations, directed 301 escalation, signed Phase One, imposed 2025 IEEPA tariffs.
Robert LighthizerUSTR (2017–2021)Ran Section 301 China case and Phase One negotiation.
Wilbur RossCommerce Secretary (2017–2021)Commerce delivered the 232 steel and aluminum reports underpinning Proc. 9704/9705.
Katherine TaiUSTR (2021–2025)Led statutory four-year review; finalized 2024 strategic tariff increases.
Joe BidenPresident (2021–2025)Kept core China 301 architecture; directed review-based increases.
John G. Roberts, Jr.Chief JusticeWrote Learning Resources opinion holding IEEPA does not authorize tariffs.
Brett M. KavanaughAssociate JusticePrincipal dissent: would have read IEEPA to authorize the tariffs (joined by Thomas, Alito).
Elena KaganAssociate JusticeConcurred that IEEPA does not authorize tariffs, emphasizing ordinary statutory tools.
Neil M. GorsuchAssociate JusticeJoined majority; concurrence on major-questions / separation of powers.
Amy Coney BarrettAssociate JusticeJoined majority parts; concurrence on interpretive method.
Clarence ThomasAssociate JusticeDissented; joined Kavanaugh’s principal dissent.
Samuel A. Alito, Jr.Associate JusticeJoined Kavanaugh dissent.
Mary AmitiNY Fed economistCo-author of 2025 tariff incidence blog and earlier pass-through research.
David E. WeinsteinColumbia / NY Fed collaboratorCo-author on 2018 and 2025 tariff incidence work.
Xi JinpingPRC leaderChinese counterpart across trade war and Phase One.
Steven MnuchinTreasury Secretary (2017–2021)Treasury role in trade negotiations and Phase One period.
Peter NavarroTrade adviserWhite House trade hawk associated with tariff escalation advocacy.
Chuck GrassleySenate Agriculture / IowaFarm-state voice during soy retaliation period.
United Steelworkers (institutional)Labor stakeholderSupported steel tariffs as industry relief; stakeholder not a finding.
U.S. Chamber of Commerce (institutional)Business stakeholderOften opposed broad tariffs as tax on importers/consumers.
American Farm Bureau (institutional)Farm stakeholderDocumented farm pain from China retaliation.
Learning Resources, Inc.Plaintiff (small business)Toy/educational importer that challenged IEEPA tariffs.
V.O.S. Selections, Inc.CIT plaintiff cohortWine importer lead in consolidated Federal Circuit path.
Jamieson GreerUSTR (second Trump term, as of 2025 coverage)Trade representative during 2025 IEEPA tariff period (role as publicly reported in litigation posture).
Richard NealHouse Ways & Means (Dem)Tariff/oversight voice in Congress during China tariff years.
Kevin BradyHouse Ways & Means (GOP, period)Republican tax/trade committee voice during first-term tariffs.
Liu HePRC Vice Premier / Phase One negotiatorChinese lead negotiator for Phase One.
Sebastian HeiseNY Fed economistCo-author of Feb 2026 incidence post.
Chris FlanaganNY Fed research analystCo-author of Feb 2026 incidence post.
Sonia SotomayorAssociate JusticeJoined Kagan concurrence path on IEEPA text.
Ketanji Brown JacksonAssociate JusticeJoined majority judgment; separate concurrence noting legislative history.
Court of International Trade (bench)Trial court for customsGranted summary judgment to V.O.S. plaintiffs (as restated by SCOTUS).
Congressional Budget OfficeNonpartisan scorekeeperProduces fiscal/economic estimates of tariff packages.
Timeline
31 dated events, 2016–2026, each with its source.
What we know now
After Learning Resources: which duties fell, which remain, what refund fights continue.
Learning Resources holds IEEPA does not authorize tariffs; V.O.S. judgment affirmed; Learning Resources D.C. path vacated for jurisdiction.
Source: Supreme Court: Learning Resources, Inc. v. Trump (slip op., Feb 20, 2026)
Read the full entryNearly 90% of 2025 tariff burden on U.S. firms and consumers through November data.
Source: NY Fed Liberty Street Economics: Who Is Paying for the 2025 U.S. Tariffs? (Feb 12, 2026)
Read the full entryOpinion repeatedly points to statutes that expressly authorize duties as the contrast case.
Source: Supreme Court: Learning Resources, Inc. v. Trump (slip op., Feb 20, 2026)
Read the full entryAuthority lost; claims processes and timelines still litigated.
Source: Supreme Court: Learning Resources, Inc. v. Trump (slip op., Feb 20, 2026)
Read the full entryFed/Census picture: China share down; other suppliers up.
Source: NY Fed Liberty Street Economics: Who Is Paying for the 2025 U.S. Tariffs? (Feb 12, 2026)
Read the full entryThe yardstick
The mainstream yardstick: Article I, 232, 301, Phase One, Biden continuity, IEEPA surge, incidence, SCOTUS limit.
Congress holds the peacetime power to lay duties; the president has no freestanding tariff power.[1][2]
On the timelineCongress authorized national-security import adjustments after a Commerce investigation and report.[3][4]
On the timelineMarch 2018: Proc. 9705 (25% steel) and 9704 (10% aluminum) under Section 232.[5][6]
On the timelineUSTR opened and then determined China’s tech-transfer/IP practices actionable under Section 301.[7][8][9]
On the timeline2018–19 FR actions imposed additional duties on successive China lists.[10][11][12]
On the timelineChina’s counter-duties hammered U.S. soy and other farm exports; USDA ran Market Facilitation aid.[13][14][15]
On the timelinePeer-reviewed work finds near-complete pass-through of those tariffs into U.S. duty-inclusive import prices.[16]
On the timeline15 January 2020 agreement: structural chapters plus large purchase commitments; some tariff modifications.[17][18][19]
On the timelineSuccessor administration retained the main China tariff architecture rather than repealing it.[20][21]
On the timelineUSTR found practices continued and finalized higher rates on strategic Chinese goods.[20][22][23]
On the timelineNY Fed economists estimate nearly 90% of the 2025 tariff burden fell on U.S. firms and consumers.[29]
On the timelineCIT and Federal Circuit (en banc, relevant part) held IEEPA does not authorize the challenged tariffs.[2][30]
On the timeline20 February 2026: IEEPA’s ‘regulate…importation’ is not clear authority to tariff; Section 232/301 not decided.[2]
On the timeline232 steel/aluminum and China 301 duties sit on different statutes untouched by that holding.[2][5][12]
On the timeline‘Foreign countries pay’ does not match the cited incidence evidence; leverage worth is a policy argument.[29][16][31]
On the timelineOTHER READINGS
Each view says which critical-path steps it removes or recasts, what it adds, and what would have to be fake.
Political claim that tariff revenue is extracted from abroad, so Americans get a free lunch.
Simple, emotionally satisfying, and confuses legal remittance with economic incidence.
Foreign export prices would fall enough to absorb most duties; U.S. duty-inclusive prices would barely rise.
Importers remit duties to CBP — true but incomplete. [1]
Pass-through studies find U.S. prices rose nearly one-for-one in 2018–19 and still ~86–94% U.S. burden in 2025. [2] [1]
What holds up False
Fails as an incidence description on the cited evidence.
Leverage arguments can survive without this false claim.
Without tariff pain, China would not have signed enforceable IP/tech-transfer chapters.
Administration messaging around the January 2020 signing; revived whenever 301 is defended.[2][5]
Maps neatly onto real agreement chapters and later Biden continuity.
Structural chapters would not exist absent tariff pressure; purchase performance would be secondary.
Phase One text exists with IP and tech-transfer chapters. [1]
2024 review still finds serious continuing practices — incomplete victory. [3]
Purchase attainment remains contested. [2] [6]
What holds up Disputed
Partly: chapters real; full ‘mission accomplished’ overstated.
Can accept U.S. incidence and still argue geopolitics.
Metal tariffs on allies show the statute was used for ordinary protectionism.
Business and foreign-government critiques in 2018; law-review and op-ed literature.[2][1]
Allied targets make the security story awkward.
Commerce findings would be window dressing for industry rents.
Proc. 9705 expressly uses national-security findings and excess-capacity story. [1]
Ally exemptions shifted — politics visible. [1]
Learning Resources did not invalidate 232. [4]
What holds up Disputed
Motive disputed; process formally followed.
Even if pretext, statute may still authorize the act.
Kavanaugh/Thomas/Alito: ‘regulate importation’ reaches tariffs, especially in foreign affairs emergencies.
Government briefing and the principal dissent in Learning Resources.[1]
Three justices; future Congress or Court could revive the theory by statute or overruling.
2025 IEEPA duties would stand; major-questions limit would not block them.
Dissent is reasoned and joined. [1]
Majority and concurrences reject the reading; no prior president used IEEPA for tariffs. [1]
What holds up Disputed
Lost; remains the strongest legal rival path.
Does not revive ‘China pays.’
Continuity under a Democratic administration proves the China tariffs were necessary statecraft.
True continuity is awkward for ‘tariffs = pure Trump folly’ messaging.
Biden team’s review would read as confession.
Core 301 kept; strategic hikes added. [1] [3]
Continuity ≠ endorsement of every first-term tactic or of IEEPA 2025. [4]
What holds up Partly true
Partly true on China 301; false if stretched to IEEPA or all 232 ally hits.
Best when limited to China tech/IP tariffs.
Trade war costs were so large they dominate the era’s economic story.
Soy shock and MFP were real and photogenic.
Net manufacturing and farm outcomes would show tariff-dominant collapse beyond retaliation/aid offsets.
Retaliation and incidence costs are documented. [4] [3] [2]
Macro era had many shocks (including pandemic) — single-cause claims overreach. [5]
What holds up Partly true
Real concentrated harms; ‘uniquely wrecked’ is overclaim.
Strongest when kept to soy counties, not GDP.
Unilateral 301/232 and IEEPA moves wrecked WTO legitimacy; China was reacting.
Appeals to lawyers who prioritize dispute-settlement purity.
U.S. first breach would be the system’s proximate cause of death.
U.S. used unilateral statutes; WTO cases were filed. [1] [5]
China’s own non-compliance and 301 record are the U.S. statutory predicate. [2] [3]
What holds up Disputed
System stress real; one-sided blame incomplete.
Can pair with anti-IEEPA majority easily.
Genuinely unknown
Refunds, purchase shortfalls, and how much leverage bought.
Eligibility, interest, timelines, and administrative vehicle.
Slip opinion decides power, not a claims facility.
Billions in collected duties.
Final judicial or statutory refund scheme.
A single authoritative miss score everyone accepts.
COVID, categorization fights, and tracker wars.
Central to leverage-vindication claims.
Joint official accounting both governments accept.
The no-tariff universe.
Counterfactuals are not in FR notices.
Separates coincidence from causation in leverage stories.
Nothing short of new archival proof of Chinese reservation prices.
Inner subjective motive.
Ally targeting fuels inference, not a confession.
Legitimacy of future 232 uses.
Internal documents showing knowing falsity — or court findings to that effect.
Full consumer incidence by category and month.
Margins, inventories, and threat effects intervene.
Politics of the ‘tax on consumers’ line.
Richer matched retail studies across 2025–26.
Political choice among 232, 301, 201, legislation.
Future EOs not yet written.
Markets and allies.
The next signed proclamation or statute.
True content origin after processing.
Customs origin rules vs supply-chain reality.
Whether diversion defeats the policy.
Better origin enforcement data.
WHAT PEOPLE SAY
Popular lines — China pays, tariffs always work, IEEPA covers everything — checked against primaries and labeled estimates.
What the record shows. False as economic incidence on the cited Fed and JEP evidence; importers remit, U.S. buyers mostly bear.
Who says it: Trump rhetoric / supportive media
What the record shows. Rejected 6–3; dissent would have allowed.
Who says it: Administration litigating position
What the record shows. False: IEEPA tariffs lose; 232 and 301 remain separate.
Who says it: Headline shorthand
What the record shows. Disputed motive; formal Commerce finding and proclamations exist; not decided in Learning Resources.
Who says it: Free-trade critics
What the record shows. Not established here; different statute from IEEPA; WTO politics ≠ U.S. invalidity.
Who says it: Some importers / internationalists
What the record shows. Mixed: chapters signed; 2024 review finds continuing harmful practices; purchases contested.
Who says it: Victory-lap messaging
What the record shows. Disputed counterfactual; chapters align with 301 issues but proof of necessity is unobservable.
Who says it: Trade hawks
What the record shows. Partly: continuity on 301 is real; does not validate IEEPA 2025 or every 232 choice.
Who says it: Pro-Trump continuity arg
What the record shows. Partly: retaliation harm and MFP are real; ‘ruined’ as blanket overclaim.
Who says it: Farm critics / opposition
What the record shows. Documented as the majority incidence result in cited studies — with estimate caveats.
Who says it: Economists / business critics
What the record shows. Mixed/overclaim: import shares shifted; ‘roaring back’ not established by cited Fed charts alone.
Who says it: Industrial-strategy fans
What the record shows. Disputed one-sided narrative; system stress real; China practices also central to U.S. case.
Who says it: Internationalist critics
What the record shows. Court did not need to bless the emergency finding; tool was unlawful for tariffs regardless.
Who says it: EO 14257 theory
What the record shows. Unproven; refund mechanisms litigated; not ordered as a simple rebate in the slip opinion.
Who says it: Importer optimism / headlines
What the record shows. False: 232 hit global steel/aluminum; 2025 IEEPA hit nearly all partners.
Who says it: Simplifying media
Media
Argument-making works measured against the path.
Academic spine for ‘Americans paid.’
Matching theories: Foreigners (especially China) pay the tariffs Tariffs uniquely wrecked U.S. farms and manufacturing
Centers the deal as the payoff document of the first trade war.
Matching theories: Tariffs worked as leverage (Phase One vindication)
Removes IEEPA from the tariff toolkit.
Matching theories: IEEPA authorized the 2025 tariffs (dissent path)
Puts numbers on the who-pays fight.
Matching theories: Foreigners (especially China) pay the tariffs
Official finding that practices continued.
Matching theories: Biden kept the tariffs, so Trump was right Tariffs worked as leverage (Phase One vindication)
Opens the metal-tariff era.
Matching theories: Section 232 national security was a pretext
Public memory
From ‘trade war panic’ to ‘Biden kept them’ to ‘emergency tariffs struck down.’
Lasting impact
Statutes still on the shelf, supply chains that moved, and habits of arguing about who pays.
Which tools grew, which the Court clipped.
Supreme Court holding removes tariffs from IEEPA’s toolkit until Congress speaks.
Keep-and-raise made Section 301 China duties a standing feature, not a one-term blip.
Metal tariffs and exclusion practice remain a template for future security-framed duties.
The debate. Pretext critique persists.
Hawks, importers, farm counties, justices.
A Trade Representative as central economic warrior, not quiet technician.
Small importers carried the IEEPA case to the Supreme Court.
Before/after habits in trade politics.
Tariff debates could end at ‘revenue from foreigners.’
Serious briefs are expected to cite pass-through evidence.
Tariffs imagined as simple bilateral pain.
Policy shops assume third-country rerouting.
How this guide works
This page extracts the mainstream statutory and court record first: presidential proclamations under Section 232, USTR Federal Register actions under Section 301, the Phase One agreement text, the 2024 four-year review, 2025 IEEPA executive orders, the Supreme Court slip opinion in Learning Resources v. Trump, and Federal Reserve Bank of New York incidence estimates.
Press and stakeholder voices are labeled as such. Economic incidence figures are estimates with methods, not confessions. We never cite Grokipedia. Ukraine framing is out of scope.
Rival major-network views appear as theories with `path.removes` / `path.adds` / `mustBeFake` against the critical path — including the ‘China pays’ rhetoric path and the Kavanaugh dissent path on IEEPA.
The older short case at `/files/trump/tariffs/` is kept as a gateway. Cross-links: Trump hub; immigration and foreign-gifts where borders and gifts touch trade; not a rebuild of those guides.
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