Donald Trump thanked a group of Republican national security officials Monday for coming out against his candidacy, saying it is good for voters to now know who is to blame for “making the world such a dangerous place.” . . . Mr. Trump countered in a statement of his own, saying the signatories "are nothing more than the failed Washington elite looking to hold onto their power, and it's time they are held accountable for their actions." . . . "It's time we put our foot down and declare that their gravy train is over: no longer will Crooked Hillary...