Republican Senator and ex-MMA fighter Markwayne Mullin challenges Teamster boss to a FIGHT in the middle of a Congressional hearing

Republican Senator Markwayne Mullin stood up and challenged a teamster boss to a fight in chaotic scenes in Congress on Tuesday.

Ex-MMA fighter Mullin told Sean O'Brien to stand up as he adjusted his wedding ring and looked ready to lunge during Tuesday's wild Committee on Education, Education, Labor and Pensions hearing.

But Senator Bernie Sanders interrupted and demanded Mullin sit down. 

The extraordinary interaction came just hours after the House was thrown into disorder when former House Speaker Kevin McCarthy was accused of elbowing a colleague.

The confrontation on the Senate side was sparked by O'Brien challenging Mullin to a fight in June on Twitter, when he called him a 'clown' and a fraud.'

'You know where to find me. Anyplace, Anytime cowboy,' O'Brien warned.

Mullin used his questioning to confront O'Brien and read some of the tweets.

'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,' Mullin said.

'OK, that's fine. Perfect,' O'Brien responded.

'You want to do it right now,' Mullin hit back. 

'I'd love to do it right now,' O'Brien said.

'Well stand your butt up then,' Mullin retorted, and told O'Brien to stand up.

Sanders then jumped in, banged the gavel and said to Mullin: 'You're a United States senator, sit down.'

'This is a hearing, and God knows the American people have enough contempt for Congress let's not...'

Mullin and O'Brien then cut him off and started shouting at each other again. 

Tuesday's near-brawl is not the first time the two have almost come to blows. 

During a Senate Health, Education and Labor Committee hearing in March, O'Brien accused Mullin of being a 'greedy CEO.'

The senator replied: 'shut your mouth.'

Mullin is the freshman senator from Georgia. He was elected to the Senate in 2022 after serving as a House member since 2013.