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Who is James Mattis’ replacement, Patrick Shanahan?


Defense Secretary James Mattis’ surprise resignation wasn’t supposed to go into effect until February, but a presidential tweet brought the end of his service to just after the new year. Ali Velshi breaks down who Patrick Shanahan is and what we can expect from the Defense department during this transition. Weighing in: Defense One Executive Editor Kevin Baron, MSNBC Terrorism Analyst Malcolm Nance, and former Spokesperson for the U.S. Mission to the U.N. Hagar Chemali.