Democrats to vote tomorrow to hold A.G. Barr in contempt

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The House Judiciary Committee is scheduled to vote Wednesday to hold Attorney General Barr in contempt for refusing to release the full unredacted Mueller report to Congress as Democrats threaten to hold former White House Counsel Don McGahn in contempt. Laurence Tribe tells Lawrence O'Donnell that impeachment proceedings should begin: "There is a point when caution becomes cowardice and a point when cowardice becomes betrayal of the Constitution."