Take away Federal funds and Federal facilities from States, Counties, and Municipalities that interfere with the enforcement of Immigration Law.
Dependence on Federal funding is a fiscal Achille's Heel for Blue States. Use that as leverage and exploit that for advantage.
The Federal Government has no obligation to subsidize state, county, and municipal programs. States, counties, and municipalities have their own local tax authority to fund themselves. If they want Federal money, they need to play by Federal rules.
He who has the gold, makes the rules.