I work in finance. I have seen countless tax returns from illegals over the years. They file with an ITIN, yet also report income from a W2 with a stolen/fraudulent SSN. They have zero withholding from their paychecks. They claim dependents who are all in Mexico. They get thousands back every year, without paying a dime. We're talking untold billions of taxpayer money going to them. Could the gov stop that any time? Of course they could. It would take minutes to put a filter on filers who report W2 with an SSN that are filing under an ITIN. But they don't. They won't.