Presidents of both major parties have used the device and experts called into question legality of Trump’s move

Donald Trump said on Tuesday he is terminating all documents, including pardons, that he said his predecessor Joe Biden signed using an autopen – an unprecedented attempt to rollback a previous president’s actions using what legal thinkers view as a flimsy pretext.

The autopen is a device used to replicate a person’s signature with precision, typically for high-volume or ceremonial documents. It has been employed by presidents of both major parties to sign letters and proclamations.