They've got it bass ackwards. They should ask, and if they misrepresent themselves as citizens, they should be handed over to the INS to be deported.
The Montgomery County Excecutive, Doug Duncan, is the one who told the county LEO's that illegals were not their problem and that the need not contact the INS. It's only when they start shooting the citizens and TV time is availble that illegals become a county LEO problem.