Republicans allege that former President Joe Biden was not in control of his own administration and that his aides may have been behind executive orders and pardons signed with an automatic pen device.

Trump, who has been calling for investigations since March, said Biden would not have entertained his administration’s more left-leaning moves if he were in full control.

“I don’t believe it was Joe Biden,” Trump said.

“He’s been a sort of a moderate person over his life, and a smart person, but somewhat vicious person, I will say, if you feel sorry for him, don’t feel so sorry because he’s vicious,” he said.

Those allegations have now led to an investigation by the House Oversight Committee into who had access to the autopen and whether it was used without the former president’s full knowledge.

Even though Friday’s press conference was intended to be a farewell for Department of Government Efficiency head Elon Musk, the Biden administration came up as well.

“Do you think that [former first lady] Dr. Jill Biden should also have to come in and testify about what she did or didn’t do?” Fox News correspondent Peter Doocy asked.

Trump expressed a measure of sympathy for Jill Biden, saying that her husband was facing many problems toward the end of his presidency, but then turned the subject back to the autopen.

“You have somebody operating it, or a number of people operating it,” the president said. “I knew Joe Biden. Joe Biden was not in favor of opening up borders, letting 21 million people into this country. … Who signed these orders, proclamations, and all of the different things that he signed that set our country so far back?”

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It’s unclear what, if anything, will come of the investigations or if any actions taken by Biden during his presidency could be undone after the fact. The Senate has started its own investigation into who controlled the Biden White House.

Asked how staffers would operate the pen without Biden’s knowledge, Trump said it wouldn’t happen if he were president.

“If it happened on my watch, I would be able to see it,” Trump said. “The next day, or sooner, I’d be reading about something that I knew nothing about [in the news]. ‘Who the hell signed this?’ So I almost never used the autopen.”