I believe that teh term ""illegal Aliens" is used in US law to mean people who are in the US unlawfully.

I have the feeling that, and would need someone to confirm or deny, that an "immgrant", according to US law is someone who has made official representation of their desire to live in the US. And if this can be confirmed then we have a proper way to separate "illegal aliens" from "immigrants" and therefore shut up those who say that we are anti-immigrant and really then concentrate on law breakers.