They don't deserve the hospitality of our asylums. They should be kept here until we finish building the glorious wall. Then we can make the wall fricking electric and make sure that there are signs in Spanish warning Mexicans not to dare cross the American border. We can also have some mines behind the wall after a considerable distance so as to blow the guts of illegals sky-high if they do somehow make it over or under the wall. It would also be wise to have drones at the ready to shoot down illegals if they make it past the mines.
If the border was as protected as Area 51 America's illegal immigration problem would be almost no problem