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Melber: Mueller asking Nunberg ‘to go into a grand jury box’ is significant

13:50

Former Trump campaign aide Sam Nunberg made multiple appearances on television, publicly bashing the president, defying the special counsel's subpoena and daring Bob Mueller to arrest him. This morning, Nunberg is switching gears, saying he'll probably cooperate with Mueller. MSNBC’s Ari Melber and Katy Tur plus MSNBC National Security Contributor Matthew Miller break it all down.