President Donald Trump on Monday was asked about former President Joe Biden’s recent interview with the New York Times, in which he said that he personally made every clemency and pardon decision during the last few weeks of his presidency that were signed with the autopen.

Biden hit back at Trump and others who’ve claimed that aides acted with the autopen without Biden’s knowledge. “They’re liars. They know it,” Biden told the Times.

“Well, I mean, you’re talking about the autopen. Look, the auto pen I think is maybe one of the biggest scandals that we’ve had in 50 to 100 years,” Trump said when asked about Biden’s comments.

Trump added, “I guarantee you he knew nothing about what he was signing, I guarantee you.”