Very simple solution to Illegal Immigration in America
Sell Green Cards allowing an unlimited stay for $10,000 apiece at the border after the applicant submits to a week long background check, is screened for diseases, and gives a DNA sample, fingerprints, voice print, and retinal scan. A social security card will also be issued with the understanding that full SS benefits will only be granted when American citizenship status is achieved.
Prospective employers would be allowed to sponsor workers and pay the fee. For those showing financial need, a payment plan involving wage garnishment can be made.
This simple solution would end the problem and net the United States government at least a trillion dollars.