Bombshell: Why James Comey’s “pee tape” claim matters to Bob Mueller

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James Comey says it’s “possible” a tape of Russian "Prostitutes Peeing on Each Other" is real. Christina Greer, a fellow at NYU`s McSilver Institute, Nicholas Kristof, a Pulitzer Prize winning columnist for The New York Times and former U.S. Ambassador to Russia Michael McFaul join "The Beat with Ari Melber."