What's not cool? It's not a derogatory term.

According to Webster:

Illegal:
: not according to or authorized by law : unlawful, illicit ; also : not sanctioned by official rules (as of a game)

Alien:
1 a: belonging or relating to another person, place, or thing : strange: b: relating, belonging, or owing allegiance to another country or government

So illegal alien is an accurate description IMO.

__________________
Wake up every day that would be a start.