A Senate hearing got heated on Tuesday when Sen. Markwayne Mullin (R-OK) stood up in an apparent move to fight Teamsters President Sean O’Brien.

The move came after O’Brien, testifying before the Committee on Health, Education, Labor, and Pensions about unions, challenged Mullin to a fight in June on X, formerly Twitter. In a post, he called Mullin a “clown” and “fraud” and ended with, “You know where to find me. Anyplace, Anytime cowboy.”

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Mullin used his time during questioning to confront O’Brien over the comments. He read off some of O’Brien’s tweets, adding, “Sir, this is a time, this is a place. You want to run your mouth? We can be two consenting adults — we can finish it here.”

“OK, that’s fine. Perfect,” O’Brien responded to the challenge.

“You want to do it right now?” Mullin, who fought professionally as an MMA fighter before coming to Congress, asked.

“I’d love to do it right now,” O’Brien said.

“Well stand your butt up then,” Mullin taunted, with O’Brien telling Mullin to do the same.

Mullin then stood up from his chair and adjusted the wedding ring on his finger as Sen. Bernie Sanders (I-VT), who was running the hearing, began pleading for them to stop.

“You’re a United States senator, sit down,” Sanders said, banging the gavel. “This is a hearing, and God knows the American people have enough contempt for Congress let’s not—” he added before being cut off by the two men.

Mullin and O’Brien then went back and forth about the remarks, including an apparent challenge to fight for charity, as Sanders struggled to maintain control of the room.

“We’re not here to talk about physical abuse,” Sanders told the two.

Mullin, pointing toward O’Brien said he doesn’t care about respecting him and O’Brien responded by saying he doesn’t respect the Oklahoma senator at all either.

The back and forth and taunting continued until Sanders cut them both off and recognized another senator for questioning.

Mullin formally challenged O'Brien to a fight in Oklahoma earlier this year over social media, but the fight ended up not happening.

“MMA fight for charity of our choice,” Mullin said on X, formerly known as Twitter. “Sept 30th in Tulsa, Oklahoma. I’ll give you 3 days to accept.”

During the Afghanistan withdrawal in 2021, Mullin made headlines when he attempted to personally reach Afghanistan to rescue Americans as the country descended into chaos and Taliban rule.

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The tense moment came as O’Brien, United Auto Workers President Shawn Fain, and others testify about unions and workers during the hearing.