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Senate hearing chaos as Sen. Mullin challenges Teamsters president to a fight, prompting Bernie Sanders to intervene.

Tense confrontation unfolds as Sen. Mullin urges Teamsters leader to address differences immediately during congressional hearing.

Tempers flare as Sen. Mullin, fueled by past tweets, confronts Teamsters president, escalating the hearing into a heated exchange.

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Senate chaos: Sanders intervenes as Sen. Mullin challenges Teamsters boss to fight during hearing, trading insults and creating an "absurd" spectacle.

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 Mullin references heated Twitter exchange, invites immediate confrontation; Sanders urges decorum.

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 Tense moment unfolds amid discussions on labor unions; Mullin, a former MMA fighter, stands up, but confrontation is avoided.

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Despite Sanders' effort to refocus on working families' issues, Mullin and O'Brien engage in heated exchange, prompting suggestions of a charity fight and a coffee

Mullin told reporters that the confrontation wasn't personal and that he doesn't have "hard feelings" about it. "He just challenged me and I accepted the challenge," Mullin said.

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The surreal moment came soon after a separate physical confrontation involving lawmakers elsewhere on Capitol Hill. After a meeting of House Republicans, GOP Rep.