EXCLUSIVE: Less than two years ago, Teamsters President Sean O’Brien and Oklahoma Republican Sen. Markwayne Mullin nearly came to blows during a Senate Health, Education, Labor and Pensions Committee hearing on Capitol Hill, laying bare the long-running rift between the GOP and organized labor.On Friday, that same HELP Committee, now led by Republicans who maintain a majority in the Senate, extended an invitation to O’Brien to testify in an upcoming hearing on labor laws.  HELP Committee Chairman Bill Cassidy, R-La., called O’Brien "an important voice in the conversation" on labor, citing his...

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