The local officials who support him would say that they are not going to demand that the citizens of the County pay for laws that are not being enforced in the rest of the nation.
The County Treasurer would say that there will be no need to raise taxes because the Sheriff has removed the illegal aliens from the County. By doing so he has cut the costs of schools, jail detentions, court costs, medical care, welfare and crime. (Neat, huh?)
It wouldn't take long before the cities would follow along because they would be getting phone calls asking why they are not supporting the Sheriff in reducing costs. The city police would be told to follow the sheriffs example. Then the surrounding counties would start to see the benefits to this cleaning of illegals.
Legal immigrants would be encouraged to come to the County to fill in the empty employment spaces. Just make sure to have their green cards or other documents showing that they are in the US legally.