A Tuesday hearing in the Senate devolved into an angry confrontation between Sen. Markwayne Mullin of Oklahoma and International Brotherhood of Teamsters President Sean O’Brien.

Jul 19, 2024 · Sen. Markwayne Mullin (R-Okla.) says Sean O’Brien, president of the International Brotherhood of Teamsters, apologized to him after both drew headlines for challenging each other to …

8 hours ago · The moment when Mullin challenged Sean O’Brien to a fight According to Mullin’s senate profile, he is a former undefeated Mixed Martial Arts (MMA) fighter with a professional record of 5-0.

Oct 8, 2025 · In his hearing discussion with Teamsters President Sean O’Brien, Senator Mullin credited President Trump with getting both leaders to the table to find common ground on labor issues.

On March 8, 2023, Mullin accused Teamsters president Sean O'Brien of "intimidation" during a Senate HELP Committee hearing on the PRO Act, claiming that O'Brien was forcing union members to pay …

Nov 15, 2023 · Sen. Markwayne Mullin challenged a union president to a physical fight, upset about what the man had written about him on social media. KOCO 5 invited Mullin to join us for a live …

Nov 14, 2023 · Republican Sen. Markwayne Mullin challenged Teamsters General President Sean O'Brien to a fight during a hearing on Tuesday.

Jun 26, 2023 · Oklahoma Republican Sen. Markwayne Mullin threw down the gauntlet with Teamsters General President Sean O'Brien, challenging him to a charity MMA fight in the octagon.

Updated on: November 14, 2023 / 8:42 PM EST / CBS News. Washington — Republican Sen. Markwayne Mullin of Oklahoma challenged the president of the International Brotherhood of …

Nov 14, 2023 · WASHINGTON − The Senate almost turned into The Octagon on Tuesday as Oklahoma Sen. Markwayne Mullin invited a Teamsters boss to throw down in a fit of anger over the union …