KEY POINTS
  • A Republican senator and the president of the Teamsters union nearly got in a fistfight in the middle of a Senate hearing.
  • "You want to run your mouth. We can be two consenting adults, we can finish it here," Sen. Markwayne Mullin told Sean O'Brien during a hearing on labor unions.
  • The committee chair, Sen. Bernie Sanders, broke up the argument. "You're a United States senator!" he shouted at Mullin.

A Republican senator and the president of the Teamsters union nearly got into a fistfight Tuesday in the middle of a Senate committee hearing, until Sen. Bernie Sanders stepped in and broke it up.

The exchange began when Sen. Markwayne Mullin, of Oklahoma, read a tweet that Teamsters President Sean O'Brien had posted in June.