Watch: Ari Melber’s interview with 4 key Mueller witnesses

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In an unprecedented exclusive interview, MSNBC Chief Legal Correspondent, Ari Melber, brings together four witnesses involved in Bob Mueller’s Russia probe. The witnesses – Jerome Corsi, Sam Nunberg, Michael Caputo and Carter Page – are each linked to President Trump, are each directly involved in the Russia probe and have each given testimony to Federal investigators. Topics in the wide-ranging interview included Roger Stone, Trump Tower Moscow, the question of Russian collusion and possible additional indictments.