"But what happened?" asked Cavuto. "What turned you off? Was it the whole January 6 thing?"

"That's a part of it, I think it's a contribution of factors," said Ryan. "But I think it really is his character at the end of the day, and the fact that if you're willing to put yourself above the Constitution, an oath you swear when you take office, federal office, whether there's president or a member of Congress, you swear an oath to the Constitution. And if you're willing to suborn it to yourself, I think that makes you unfit for office."

This comes as Ryan, who helped Trump pass his signature tax cut legislation in 2017, has gradually become more outspoken against him, calling him an "authoritarian" and a "narcissist." Ryan has also said he cannot vote for Trump this year, which has caused the former president to rage against the former speaker on social media.

In one such rant last month, Trump proclaimed: "Rupert Murdoch should fire pathetic RINO Paul Ryan from the Board of Fox. Ryan is a loser, always has been, and always will be. He was the WEAKEST & MOST INCOMPETENT Speaker of the House in its History. Fox will sink to the absolute bottom of the pack if Paul Ryan has anything to do with it!"

Watch the video below or at the link here.