Man, you guys are way off on the appeal of Trump. If you think the GOP wants him, you are off your meds.
Who says the GOP wants Trump? Clearly a significant number of GOP voters do, but the party leadership and insiders so not. Why not? Two reasons. First, he's not a fiscal conservative. Second, he pretty much guarantees a Democratic win.
To tell people that shutting down Muslim immigration to US temporarily is anti-American and "not that simple" is why people are running to Trump, because, frankly, it IS that simple.
Not everything has to be complicated, but some suggestions are are overly simplistic. Codifying overt religious discrimination into our immigration laws isn't simple at all. First, though it's not unconstitutional, it very much goes against conventional American values, and it would not surprise me to see the Supreme Court strike it down.
Second, if you think it won't have international implications, you're nuts. We have very significant and friendly economic, military, and diplomatic relations with several nations with large Islamic populations. Are we ready to tell them all to **** off?