Not enough boats to ship them back on. Stem the tide at the border, then recognize reality and assimilate the rest.
(Denny Crane: "I Don't Want To Socialize With A Pinko Liberal Democrat Commie. Say What You Like About Republicans. We Stick To Our Convictions. Even When We Know We're Dead Wrong.")
Well, there is the option that General Trujillo took against the Haitian illegals in the Dominican Republic. Don't think the American people have the stomach for that though...
It isn't possible to assimilate those who have no desire to assimilate. If the Borders were secured, and the incentives, and government handouts were taken away, most would deport themselves. However I don't believe those we elect to represent us have the courage, or the will to do what is necessary to save the country.
They don't want to assimilate. They want to be legal to work here but keep their Mexican citizenship. They want us to become like to EU and come and go as they please, yet if they work in the US they are eligible to receive our benefits. Mexico needs them to work here and get the education and healthcare, if we provide it they don't have to, in the meantime the money sent home fuels their economy. They don't have to do anything. Vincente Fox is like a pimp sending his ho's out and getting a cut of what they make. And as for doing jobs nobody else wants to do, bull, they are putting American workers out of business.