Uh, how about acknowledging when their foot first stepped onto American soil a crime?
ping
If he accepts the new policy, he can still conduct sweeps, but his deputies will have to release illegal immigrants who have not committed crimes.
No problem. If the illegal aliens are working they are violating federal law. If they are using a fake social security number or someone else's number they are violating state and federal law.
Joe can comply and still rid the county of most of these criminals.