Watch: US senator challenges union boss to fight during hearing

A Senate hearing escalated into a near brawl on Tuesday when Oklahoma’s Republican Sen. Markwayne Mullin asked Sean O’Brien, the president of the International Brotherhood of Teamsters, if he wanted to fight “right now.”

An Oklahoma senator has challenged a union president to a fight during a Senate hearing on Tuesday night.

Senator Markwayne Mullin rose from his seat and challenged Teamsters president Sean O'Brien to a fight, before the committee chair stepped in to defuse the confrontation.