Out of fear of being off-topic, I’ll just say no, of course we shouldn’t, and of course it’s in no way anything approaching legal. It may even be illegal to seriously suggest that they should, unless no one arrests you because you’re somehow being mistaken for a viable presidential candidate, or just because no one who realizes it’s a problem can really quite believe what’s being said.
I think Trump is playing “how ridiculously can I behave and still be a successful candidate?” It’s actually doing a fantastic job of illustrating how ridiculously bad our political system, media, political establishment, and so on are.
Should I have mentioned our education, too? How can these even be valid questions for adults? How can a candidate who suggests such things be taken seriously by our other politicians, and our media, and so much of our public?