Interesting that he was questioning not only Rubio's toughness but his adulthood only last week. Like The Donald is an expert on being an adult.
Sorry, Donald. Too little, too late. You've burned your bridges. No united party for you.
It's going to be fascinating watching the Donald try to act like an adult human being in coming weeks as he tries to undo all the damage he did during the primary race so far. Ain't gonna happen.