Trump's approval rating in Israel is very high and considering how much they control the GOP and network donors the answer is he has no chance of being dethroned in primaries. He is an incumbent and will have more money than any of his challengers by far. He probably won't spend any of his own money this time around either. I would like to see him get primaries, but that list right now includes candidates that are all unelectable against Trump or most democrat candidates. I doubt any one of them even have above a 50% approval within the party. Bob Corker and John Kasich are extremely unpopular among their own voting base right now.