Donald J. Trump and his allies have begun investigations to support their claims that Joseph R. Biden Jr. was incapacitated and his staff conspired to take presidential actions in his name.

Former President Joe Biden last week defended the use of an autopen to sign clemency decisions he made the last days of his term, The New York Times reported.

Joe Biden said every pardon and commutation he issued was his decision, calling Republican "liars" for alleging his aides illegally used an autopen.