Check out tvc's response for how Obama has tied their hands locally.
At the Border they are caught, Border Patrol registers them, and lets them go, in AMERICA!! They just get to give their name and info and stay in our country. I've wondered what's the point of the Hwy Patrol being down there if they can't do anything. Seems like a waste of money to me. They should just let them all walk across the main bridge and save everyone money and time.