The Republican senator as well as the head of the Teamsters union were close to getting into a fistfight on Tuesday during an Senate committee hearing until Senator. Bernie Sanders stepped in and ended the fight.

The debate started after Sen. Markwayne Mullin, of Oklahoma was reading an article that Teamsters president Sean O’Brien had posted in June.

“You are looking to speak with your mouth? There’s no need to be two adults who consent, and we’ll finish it there,” Mullin said to O’Brien, who was a witness in a hearing about the labor movement in America.

“OK, that’s fine, perfect,” O’Brien replied. “I’d love to do it right now.”

“Then stand your butt up then,” Mullin shot back.

“You stand your butt up,” O’Brien said.

Mullin wearing a white shirt with no jacket, stood up and started to walk towards O’Brien.

“No, no, sit down! Sit down! You’re senator! United States senator!” The senator shouted Sanders who is the Vermont independent who is chair of the Senate Health, Education, Labor, and Pensions Committee.

Mullin And O’Brien continued smack one another during the meeting room.

“This is an open hearing. And God knows that the American people are already snobby enough for Congress Let’s not just make it worse,” Sanders said.

The dispute between the boss of the union and senator had begun several months before.

Mullin asked O’Brien “shut your mouth” in the course of a heated argument at a prior court hearing held in the month of March.

In a post on social media later in June O’Brien lashed out at Mullin as an “clown and a fraud.”

“Quit your tough man attitude during these Senate hearings. You’ll locate me. Anywhere, Anytime cowboy.” O’Brien posted on X.

A few days later, Mullin responded with fire, declaring he had took the offer and was suggested the idea of a mixed martial art fight to raise money for charity.

This exchange caused Mullin to call O’Brien into an argument in the hearing on Tuesday.