Trump picks Rep. Mike Waltz, a former Green Beret, as national security adviser  ABC NewsTrump asks Mike Waltz to serve as his national security adviser  CNNTrump builds hawkish team with Rubio and Waltz tipped for top jobs  The Guardian USGOP Rep. Mike Waltz tapped to be Trump’s national security adviser  Fox NewsTrump transition live updates: Trump taps Waltz for national security adviser  USA TODAY