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BEDMINSTER TOWNSHIP, NJ - NOVEMBER 19:  (L to R) President-elect Donald Trump shakes hands with retired United States Marine Corps general James Mattis after their meeting at Trump International Golf Club, November 19, 2016 in Bedminster Township, New Jersey. Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration.  (Photo by Drew Angerer/Getty Images)
BEDMINSTER TOWNSHIP, NJ - NOVEMBER 19:  (L to R) President-elect Donald Trump shakes hands with retired United States Marine Corps general James Mattis after their meeting at Trump International Golf Club, November 19, 2016 in Bedminster Township, New Jersey. Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration.  (Photo by Drew Angerer/Getty Images)

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    Extra hurdle to clear for 'Mad Dog' Mattis

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Extra hurdle to clear for 'Mad Dog' Mattis

If President-elect Donald Trump picks Gen. James Mattis as his defense secretary, his selection will require an extra congressional hurdle. CNN's Jim Sciutto reports.

Extra hurdle to clear for 'Mad Dog' Mattis

If President-elect Donald Trump picks Gen. James Mattis as his defense secretary, his selection will require an extra congressional hurdle. CNN's Jim Sciutto reports.