Fox News contributor Charles Krauthammer called the idea of impeaching President Trump "a catastrophic mistake" on Thursday, warning that there's no evidence Trump has committed a crime.

"Collusion is unseemly but it ain't a crime," Krauthammer said in an interview with Fox News's Tucker Carlson. "You've got a political establishment, mostly Democratic but there are some Republicans, that would like to see him taken out of office."

"I think that would be a catastrophic mistake," he added.

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Krauthammer warned that impeaching Trump would cause millions that voted for him to question the stability of American democracy.

"It would cause a rupture in the country where people would say, 'When we people, the ones who have been abandoned, elect someone we like, our guy gets taken out? I thought we had a stable democracy,'" he said.

He stressed that he was not defending Trump, only that he thinks impeachment is a mistake.

"Again, I think he's unfit," Krauthammer said, "but that's not the grounds for removal."

"If you think a man is unfit, you vote against him," Krauthammer added. "But you don't remove him from office. And that's where I'm afraid we are headed, given the forces that surround the president."

In July, it was reported that as many as 25 House Democrats are working on a bill to begin impeachment proceedings for the president, but no Democratic leaders have signed on to the proposal.