In context they were discussing the American-Mexican border, and Americans wouldn't wake up and secure their nation UNTIl another attack on American soil happens.
I suppose. I'm a hell of a lot more worried about the federal government using "as much violence as necessary" to "protect" me from undocumented immigrants than I am about undocumented immigrants alone.
Realistically from what I've read the issue has been taking care of itself anyway due to the dismal economic conditions (and the subsequent decrease in labor demand).