(FILES) This file photo taken on November 19, 2016 shows US President-elect Donald Trump shaking hands with retired United States Marine Corps General James Mattis after their meeting at Trump International Golf Club, in Bedminster, New Jersey. Trump has reportedly selected retired Mattis as his secretary of defense, according to US media citing a source close to the transition team. / AFP PHOTO / GETTY IMAGES NORTH AMERICA / Drew Angerer