A fence is our only hope. Nothing can defeat a fence. Except maybe bolt cutters, which Mexicans obviously don't have. My Leatherman will also cut through a chain link fence, but no way the Mexicans have one of those. One could use a shovel to dig under it, but I doubt they have shovels in Mexico, and even if they did, no one there would know how to use one. Might also just be able to drive through it, but luckily for us, they don't have cars in Mexico.
Yep, a fence is our only answer. it'll be an impenetrable barrier. Like the Death Star's force field.
More importantly, it'd help distract attention away from the only thing that'll actually work, which is vigorous prosecution of businesses employing illegals. The magnet that attracts them in the first place.
But that would be highly unpopular with the leaders of both parties. So let's talk about a fence. Damn it, we need a fence!