Rumble in the Senate: Senator challenges union boss to fight mid-committee hearing

Teamsters President Sean O'Brien: We proved to Corporate America that labor can be a market changer

WATCH: Oklahoma senator challenges Teamsters president to a fight during Senate hearing

WATCH: Sean O'Brien Mocks Markwayne Mullin on Fox News

Sen. Markwayne Mullin challenges Teamsters leader to a fight. Bernie Sanders intervenes

General President Sean M. O’Brien Takes On Greedy CEOs and Their Mouthpieces in Congress

Sean O'Brien Compilation