Biden told supporters at a fundraising event on Tuesday that “If Trump wasn’t running, I’m not sure I’d be running.”

He has framed Trump running again to be commander in chief as an existential threat to the country, adding at the fundraiser that “we cannot let him win.” He later told reporters following that Tuesday fundraiser that he wouldn’t end his bid. “Look, he is running, and I have to run.”

This comes after there has been a new focus on Trump’s authoritarian tendencies in the campaign. In a town hall with Fox News’ Sean Hannity earlier this week, Trump again indicated that he would use the levers of power to take revenge on his enemies if he is reelected.

“He says ‘you’re not going to be a dictator, are you?’” Trump said. “I said ‘no no no, other than day one.’”