FILE-In this Oct. 25, 2017 file photo, Senate Foreign Relations Committee Chairman Bob Corker, R-Tenn., talks to reporters as he returns to his office from a vote, on Capitol Hill in Washington. Taking on a crowd of jeering union workers, standing up to a charismatic Democratic opponent on his home turf or lecturing upper management of one of the world's largest corporations, Tennessee Sen. Bob Corker has rarely backed down from a fight. (AP Photo/J. Scott Applewhite, File)

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