>> The phrase “class of alien” will have to pass a legal test <<
It’s really a very interesting Constitutional question.
On the one hand, using any kind of religious test would seem to violate the First Amendment. I think Anthony Kennedy could easily be persuaded, and the four Dhims on the SCOTUS are sure votes from the git-go.
But on the other hand, who would have standing to bring suit in a Federal court? Some alien who is outside the USA? No way, IMHO. And I can’t think of anybody else.
So if you can conjure up a plausible plaintiff, I’m all ears!
Only if it's used against muslims. It's being used against Christians and the Supreme Court doesn't seem to mind a bit.