If these "unauthorized (eg: undocumented) immigrants are employed and making positive contributions to our country, I don't think that they can harm the System. The biggest problem in the US is the failure of EVERY American citizen to exercise their right to have their voice heard through the ballot box. I suspect that those who don't want immigrants to vote are those who have not vested themselves in the American process by voting. If you don't vote you ARE part of a growing problem. You cannot complain about the mess in the congress if you did not vote!!!!