Cut off funding, Hell.
Throw the mayors, city council members, and police chiefs in jail.
Well if you want to look at sanctuary cities for what they are, they do force the middle class to work longer hours to fund all those freebies and the criminals that are drawn to the cities do subject their citizens to more crime (particularly in areas pertaining to drugs, murders, vehicular deaths caused by DWI, kidnappings (babies), theft (big time; rings), and identity theft (major problem). Then there's the other problems in society they create when they don't have vehicle insurance, are carrying fake ID and using someone's identity killing their credit ratings, overpopulation, using so much of the social services other taxpayers can't receive them, not paying taxes, bankrupting cities, voting illegally to keep the wrong people in power for freebies, protests that are staged for said people in power, etc...In other words, major problems...
Been watching him on Fox - he's thrilled that Trump wants sessions as AG and believes that enforcing the rule of law will do the job - enforcement entails prosecuting those who flout the law.....gonna be a howl heard in Hell when Trump does his duty and enforces the rule of law....
Obummer taught Dem that disobeying/disregarding the Law is quite alright. Change is coming...