The Nixon case that Mueller's allies can use against Trump

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The final decisions about Special Counsel Mueller’s work could soon be in the hands of Trump’s Attorney General pick, William Barr. In a Special Report, MSNBC Chief Legal Correspondent, Ari Melber, examines how the confirmation hearings for Barr could be a pivotal moment in the Mueller probe, drawing on parallels from the Nixon era and the Watergate probe to show how the Senate can require Barr, under oath, to back up Bob Mueller.