Problem Solved

Bring all our troops home from Iraq to guard the border. When they catch an illegal immigrant crossing the border, hand him a canteen, rifle, and some ammo and ship him to Iraq. Tell him if he wants to come to America then he must serve a tour in the military.

Give him a soldier's pay while he's there and tax him on it. After his tour, he will be allowed to become a citizen since he defended this country. He will also be registered to be taxed and be a legal patriot.

This option will probably deter illegal immigration and provide a solution for the troops in Iraq and the aliens trying to make a better life for themselves.

If they refuse to serve, ship them to Iraq anyway without the canteen, rifle, or ammo. Problem solved. (It's a longer hike back to the border from over there than from Mexico.)