So if hypothetically we went to war with country X tomorrow, the president would not be able to suspend entry of X nationals without an act of Congress?
Yeah, I guess I was using war in the colloquial term (I don't believe the US has issued a formal declaration of war since World War II)
FWIW I think banning green card holders was stupid (both legally and politically - predictability is good for a legal system, and we already made a promise to green card holders. Politically he had to have known this backlash would happen).
It's just that...I don't know, it seems so polarized right now that you have to support one of two sides, and both are insane. The natural end game of "the right" is that no one else is allowed to come to America, ever. The natural end game of "the left" is that anyone who wants to come to America can, and the magical institutions of America will transform them into Americans, regardless of what they presently believe or how many of them there are. And there is a ratchet effect on both sides, where if you don't believe the most extreme version, you either hate America and its historic population, or you're a racist xenophobe.