Famed economist Paul Krugman on Tuesday went after Donald Trump over his attempt to fire Federal Reserve Governor Lisa Cook, who has vowed to remain in the post and is planning to file a lawsuit over the president’s move.

“This is completely insane,” said Krugman, the 2008 winner of the Nobel Memorial Prize in Economic Sciences, in an interview with CNN’s Jake Tapper.

Krugman stressed that there’s “no evidence” that would warrant Trump’s firing efforts, which the president has tied to allegations that Cook — who was appointed to the post by Joe Biden in 2022 — committed mortgage fraud.

Cook has contended that she hasn’t been charged or convicted of any wrongdoing.

In a post to his Substack newsletter Tuesday, Krugman warned that if Federal Reserve Chair Jerome Powell caves to the president or the Supreme Court “acts supine again and validates Trump’s illegal declaration” on Cook, “the implications will be profound and disastrous.”