Fmr. U.S. Atty.: I signed letter rebuking Trump due to his 'vile, dangerous' actions against Brennan

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More than 175 former government officials signed a letter condemning the President's decision to revoke former CIA Director John Brennan's security clearance. One of the officials on that letter, former U.S. Attorney Harry Litman, joins Katy Tur to describe why he signed on.