GOP Senator, Teamster president physically threaten each other in hearing: You want to do it now? Oklahoma Sen. Markwayne Mullin and Teamster President Sean O’Brien were involved in a heated argument on the Senate floor broken up by Sen. Bernie Sanders. NEW You can now listen to Fox News articles! Nearly two and a half years after they nearly came to blows in a viral Senate hearing, Teamsters President Sean O’Brien offered praise for Sen. Markwayne Mullin, R-Okla., on Thursday after President

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