Trump selects 'Mad Dog' Mattis for secretary of defense

Donald Trump kicked off his "thank you tour" with the announcement that he was selecting retured Gen. James "Mad Dog" Mattis for secretary of defense, a move that will break from the custom to have a civilian lead the Pentagon. For Mattis to be confirmed, Congress would first have to approve legislation bypassing a law that bars retired military officers from becoming defense secretary within seven years of leaving active duty.

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