This is because it's not just illegal immigration that is out of control. So is legal immigration. U.S. law in effect treats immigration as a sort of imitation civil right, extended to an indefinite group of foreigners who have been selected arbitrarily and with no regard to American interests.
Whether these foreigners deign to come and make their claim on America—and on the American taxpayer—is pretty much up to them.
Alien Nation, P 5