I keep on hearing let's build a wall.
But I don't hear much about internal enforcement. About half of illegal immigrants are visa overstays. Also, solid employer sanctions would do much to combat illegal immigration, currently all they really get is a slap on the wrist.
http://www.foxnews.com/story/0,2933,198298,00.html
PD
PS. Yeah, that's right. I cited Fox News.