A fight nearly broke out in the United States Senate.

During a hearing of the Senate Committee on Health, Education, Labor and Pensions on Tuesday, Sen. Markwayne Mullin (R-Okla.) read a tweet from Teamsters President Sean O’Brien that suggested he was a ā€œfraud.ā€

ā€œGreedy CEO who pretends like he’s self made. In reality, just a clown fraud,ā€ O’Brien wrote in June post, adding, ā€œAlways has been, always will be. Quit the tough guy act in these senate hearings. You know where to find me. Anyplace, Anytime cowboy.ā€

After reading the tweet, Mullin said, ā€œI wish you was in the truck with me when I was building my plumbing company myself and my wife was running the office because I sure remember working pretty hard and long hours.ā€

ā€œThis is a time, this is a place. You want to run your mouth. We can be two consenting adults. We can finish it here,ā€ Mullin said.

O’Brien responded, ā€œOK, that’s fine, perfect.ā€

ā€œYou want to do it now?ā€ the senator asked.

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O’Brien said, ā€œI’d love to do it right now.ā€

Watch the video below:

Mullin appeared to accept the challenge as he told O’Brien, ā€œWell, stand your butt up, then.ā€

ā€œYou stand your butt up,ā€ the union leader shot back.

Mullin then stood, however, Chairman Bernie Sanders (I-Vt.) ended the fight before it began as he told him, ā€œStop it. No, no. Sit down. Sit down! You’re a United States senator!ā€

Eventually, O’Brien asked if he could respond to Mullin, but Sanders shot that down, saying, ā€œNo, you can’t. This is a hearing and God knows the American people have enough contempt for Congress.ā€

The Oklahoma senator shot back, ā€œI don’t like thugs and bullies.ā€

However, O’Brien quipped, ā€œAnd I don’t like you ’cause you just described yourself.ā€

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Speaking to CNN after the incident, Mullin said, ā€œHe called me out. I was just answering the call. Don’t say something you’re not going to back up. It’s that simple.ā€