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WASHINGTON, DC - JANUARY 12:  Defense Secretary nominee, retired Marine Corps Gen. James Mattis speaks during his Senate Armed Services Committee confirmation hearing on Capitol Hill, on January 12, 2017 in Washington, DC. Gen. Mattis will need a waiver from Congress to bypass a law prohibiting recently retired military officers from serving as Defense secretary.  (Photo by Mark Wilson/Getty Images)
WASHINGTON, DC - JANUARY 12:  Defense Secretary nominee, retired Marine Corps Gen. James Mattis speaks during his Senate Armed Services Committee confirmation hearing on Capitol Hill, on January 12, 2017 in Washington, DC. Gen. Mattis will need a waiver from Congress to bypass a law prohibiting recently retired military officers from serving as Defense secretary.  (Photo by Mark Wilson/Getty Images)

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    Senate confirms Mattis as defense secretary

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Senate confirms Mattis as defense secretary

The Senate confirmed President Donald Trump's first Cabinet member, formally approving retired Gen. James Mattis for defense secretary. CNN's Manu Raju reports.

Senate confirms Mattis as defense secretary

The Senate confirmed President Donald Trump's first Cabinet member, formally approving retired Gen. James Mattis for defense secretary. CNN's Manu Raju reports.