Critics were outraged after President Donald Trump announced Friday in a Truth Social post that any order signed using an autopen by former President Joe Biden would be terminated.

Trump warned that if Biden objected to his move, he would face perjury charges. It wasn't immediately clear what legal authority he has to do so.

Social media users had plenty to say after the surprising claim.

"THIS IS ILLEGAL and Trump used an autopen hundreds of times," political commentator Brian Krassenstein wrote on X.

"Trump uses the Autopen because his hand is too feeble and weak, so let’s do the same with Trumps documents he signed!!!!" user Sabrina Arnett wrote on X.

"Thanks for the update, Donnie Snoozes. This Autopen nonsense will definitely help lower grocery and other costs for people," user Chris Robinson wrote on X.

"Trump claims 'any document' signed by Joe Biden is 'hereby terminated.' He calls out executive orders later but obviously 'any document' would be much broader and include legislation. (He can’t legally do that but, as always, we get to watch how far he can push this without repercussions)," Gizmodo reporter Matt Novak wrote on Bluesky.

"The autopen thing is bigtime comfort territory for Trump, but this is crazy for a number of reasons — one of those being that he’s super old, another being that he’s letting Stephen Miller run vast swaths of the federal govt," Wired writer Jake Lahut wrote on Bluesky.