Illegal immigrants are lawbreakers. And they should be treated as such.
But hey, I'm a compassionate soul, too. Round 'em up, and instead of prosecuting just put them all on a bus and send them back to their homeland.
And if you want to be pragmatic: Jesus gave Mexico to the Mexicans and He gave the US to us. I don't think Jesus cares one way or another where we live, just as long as we live there legally.
Scripture always cuts two ways. For the alien, he is required to follow our laws. What does scripture say for us? Can we ignore our instructions because someone else isn't following theirs?
What do you think of our own Founding Fathers being "illegals" against the Crown then?