The Trump administration’s official policy during both of his terms has been to use the president's hand signature on every legally operational or binding document, according to the White House.

The president was raising the point that, ‘Did the president even know about these pardons? Was his legal signature used without his consent or knowledge?'” Leavitt said at her

The device has been used in one form or another since at least Franklin Roosevelt's administration, but Donald Trump wants to cast doubt on pardons.