President Trump poured fuel on the fire in his fight with Congress over Syria, lashing out at Democrats during a closed-door White House meeting on Wednesday and sparring publicly with Republican allies.

The chaotic day was a U-turn from earlier this week when the administration applied new sanctions on Turkey in an effort to combat fierce criticism from Capitol Hill and when Republicans were dialing back their furor in an effort to get on the same page as Trump.

But the unity effort went off the rails in a closed-door meeting between Trump, congressional leadership and key committee members, which was preceded by hours of fighting between Trump and lawmakers.

Congressional Democrats and sources say the president used the meeting to fume at Democrats and former administration officials, at one point calling Speaker Nancy Pelosi (D-Calif.) a “third-rate politician” and former Defense Secretary James Mattis “the world’s most overrated general.”

“What we witnessed on the part of the president was a meltdown, sad to say,” Pelosi told reporters after she left the meeting with Senate Minority Leader Charles Schumer (D-N.Y.) and House Majority Leader Steny Hoyer (D-Md.).

“We have to pray for his health because this was a very serious meltdown on the part of the president,” she added after returning to the Capitol.

Schumer said Trump was “insulting” to Pelosi.

“She kept her cool completely, but he called her a third-rate politician,” Schumer said. “I mean, this was not a dialogue. It was sort of a diatribe, a nasty diatribe.”

A Democratic source familiar with how the meeting transpired said it “devolved into the president calling the Speaker a name. He was quite nasty, so she stood up to go. She started to sit back down but Rep. Hoyer got her to go. Pelosi and Hoyer walked out of the meeting.”