1. intend to assimilate.
2. are capable of assimilation.
Now, by assimilation, I don't just mean learning to fit in, speak English, and that sort of thing, although they are essential also. Spies do all that, routinely. I also mean becoming American. That includes renouncing all allegiance you might have to your home country, or its institutions. It includes becoming patriotic about being American. And if you have a creed or belief that is incompatible with being a patriotic American, you have to abandon such creeds or beliefs. And yes, I'm including most Islam as I know it, because it includes lots of beliefs, evidently fundamental to the faith, that require opposition to American values. If I'm wrong about that somehow, please explain why and how I'm wrong, don't just screech about the First Amendment. And, no matter what a prospective Muslim immigrant might want to do to assimilate, can he just decide he doesn't believe those things any more? Or is he not capable of assimilation in this sense?
Here's a little video that I've put up before, that shows just how being overtolerant of immigration can bollix a nation up. Now and then, though, somebody caterwauls about its political incorrectness and YouTube or whatever takes it down, so here it is again. It's truly grotesque, but rightly so, and puts the left and all its blather in perspective:
Quibcag: That's Lum, of Urusei Yatsura (うる星やつら). and she knows all about alien invasion, being an alien invader herself.