In an aggressive confrontation at a Senate health, education, labor and pensions committee, Markwayne Mullin, a Republican senator, clashed with Sean O’Brien, president of Teamsters, a US labor union, and challenged him to a physical fight.

Mullin referenced a previous hearing in March when he and O’Brien had a heated exchange over Mullin’s background as a business owner and O’Brien’s salary as the union chief.

‘I appreciate your demeanor today. It’s quite different. But after you left here, you got pretty excited about the keyboard. In fact, you tweeted at me, one, two, three, four, five times,’ Mullin said, holding up printed out versions of O’Brien’s posts on Twitter/X. Mullin read one of O’Brien’s posts out loud, in which he called Mullin a ‘greedy CEO’, a ‘clown’ and a ‘fraud’.

Bernie Sanders attempted to mediate between the two men, to little avail.

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