How about offering the employers of "undocumented immigrants" amnesty for providing pay on which taxes were paid thereby contributing to the national coffers and bolstering the economy?
In fact, let's go a few steps further. Let's offer amnesty to everyone for everything illegal. Think of the money we could save by emptying the court dockets, prisons, and disbanding all the police forces at all levels! What a great place to live we would have. (For those who are unable to discern, the last paragraph is pure sarcasm.)