A 2005 Justice Department legal opinion concluded that a president need not personally sign a bill and may direct that his signature be affixed. Obama had one used in 2011 to sign a Patriot Act extension while he was in Europe; Jefferson used a mechanical copier. [1][2][3]
There is no constitutional requirement that a pardon be signed at all, and no mechanism to revoke one. “Pardons are final and irrevocable,” the constitutional scholar Brian Kalt told PBS, and an 1869 federal ruling held that once a pardon is complete “there is no power to revoke it.” Scholars told Reuters the same after Trump’s December 2025 declaration. [3][4]
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