With selective categorization of the 12+ million already here, you are about to see an explosion in the document fraud industry in America.
Do you not think there was a similar backlash against European immigrants after the second world war? You either believe immigration is an economic and cultural positive or you think it is a negative. If you are against immigration nothing will make you happy. On the other hand, if you support immigration as good for the economy and a cultural positive than your interest is in making it work. Of course there will be abuses, someone will always try to do better than what the system allows.