President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE in a tweet early Thursday attacked JPMorgan Chase CEO Jamie Dimon, who on Wednesday said he could beat the president in an election because he's "smarter."

“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.

"I’ve made a lot of bankers, and others, look much smarter than they are with my great economic policy!”

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. I’ve made a lot of bankers, and others, look much smarter than they are with my great economic policy! — Donald J. Trump (@realDonaldTrump) September 13, 2018

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"I think I could beat Trump ... because I'm as tough as he is, I'm smarter than he is," Dimon said at an event where JPMorgan detailed a $500 million investment to boost economic growth around the world, according to CNBC.

"I can't beat the liberal side of the Democratic Party," he added.

Dimon also told the crowd that he "actually earned [my] money."

"It wasn't a gift from daddy," Dimon said, according to CNBC, in another jab at the president.

Dimon later walked back his comments.

"I should not have said it," Dimon said in a 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."

Dimon, 62, has predicted in the past year that Trump would be a one-term president, warned that Democrats lack a quality candidate to win in 2020 and credited the GOP tax cuts with accelerating economic growth.

Despite speculation he may run for office, Dimon said earlier this year that he's committed to remaining at JPMorgan Chase for another five years, which would rule out a presidential campaign in 2020.

Trump last week boasted that "nobody is going to come close" to defeating him in 2020.

--Brett Samuels contributed to this report, which was updated at 7:38 a.m.