While this would be the most uncharacteristically patriotic thing The Donald has ever done, it's not going to happen. First, he isn't going to be elected. And secondly, I can't see this clown walking away from power- especially from the chance to be the most powerful human being on the planet.
Nice thought, though.
Well, not really. It's just another example of how this loose cannon might say or do almost anything. This man's fingers must be kept as far as possible from the nuclear button.
And it's also further evidence that this whole thing is a lark to Donald. He very well may not have given any more thought to what he would do if he actually won than he has to all those silly and downright incoherent policy positions of his.