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Watch Mueller witness on the key to whether Roger Stone will flip

03:10

Donald Trump’s longest-serving political advisor, Roger Stone, has been indicted by Special Counsel Mueller for Obstruction, witness tampering and lying about efforts to obtain Hillary Clinton’s stolen emails. Mueller witness Michael Caputo tells Ari Melber in his own interview, prosecutors were "very clearly focused on collusion and conspiracy" regarding Roger Stone and it is "very clear" they wanted to make that case against Trump.