I'd cut that off in a heartbeat if I could, and I'd also not allow anyone to stay in the US unless they fully complied with immigration requirements.

If they're caught sneaking in put em on a plane back home, or better yet ship em back in the hold of an unsafe scow and hope it sinks.

Bottom line: if you're caught any time, any where in America undocumented you'd get shipped out back to your country of origin immediately.

Works for me.