President-elect Donald Trump is expected to nominate Sen. Marco Rubio of Florida as secretary of state and has asked Rep. Mike Waltz, a Green Beret veteran, to be his White House national security adviser, according to people familiar with his thinking. Trump could change his mind on the Rubio move, as he remains fond of others lobbying for the secretary of state role. But people familiar with the Rubio decision said that Trump feels good about going with him; Trump...