President Donald Trump said Jamie Dimon isn’t smart enough to run for his job.

“The problem with banker Jamie Dimon running for President is that he doesn’t have the aptitude or “smarts” & is a poor public speaker & nervous mess - otherwise he is wonderful,” Trump said in a tweet Thursday. “I’ve made a lot of bankers, and others, look much smarter than they are with my great economic policy!”

Dimon, chief executive officer of JPMorgan Chase & Co., said Wednesday that he could beat Trump in an election.

“I’m as tough as he is, I’m smarter than he is,” Dimon said, before immediately sending out a statement backing down.

“I should not have said it,” Dimon said in the statement. “I’m not running for president. Proves I wouldn’t make a good politician. I get frustrated because I want all sides to come together to help solve big problems.”

A spokesman for JPMorgan didn’t immediately respond to a call seeking comment on Trump’s tweet.

This article was provided by Bloomberg News.