FILE PHOTO: The Federal Reserve building in Washington, D.C., U.S., September 16, 2025. REUTERS/Aaron Schwartz/File Photo

By Nandita Bose

MOUNT POCONO, Pennsylvania, Dec 9 (Reuters) - U.S. President Donald Trump on Tuesday asked his treasury secretary to investigate whether his predecessor Joe Biden used an autopen to sign the appointments of some Democratic members of the Federal Reserve's Board of Governors.

"I'm hearing that the autopen could have signed, maybe all four, but maybe a couple of them. We'll take two," Trump told a rally in Pennsylvania on Tuesday. "Would you check that, Scott?" Trump asked Treasury Secretary Scott Bessent, who was present.

Trump has previously questioned the validity of official acts by Biden signed using an autopen, a mechanical device that reproduces a person’s signature and has been used for decades by presidents of both parties.

Last week, Trump said he was terminating pardons and commutations granted by Biden in January that he claimed were signed using an autopen, a move legal experts said had no basis in law.

(Reporting By Nandita Bose and Jarrett Renshaw; Editing by Ross Colvin, Himani Sarkar and Edmund Klamann)