Cities should focus on local issues. Local authorities who participate in these sweeps are creating an unsafe environment in their communities because people become afraid to interact with law enforcement. Crimes go unreported, which creates bigger problems. And then there's funding. This process of sweeping up people who MIGHT be undocumented is not cheap for local law enforcement. A sheriff in TX who just declined to participate in this immigration program said doing so in the past cost that department 300-500k. Since he's declined to sign on to the program this time around, he says he can use that money to hire more officers and get new patrol cars. Here's the thing, on one hand republicans rage against big government then turn right around and try to bully cities into doing what they want. They threaten funding to sanctuary cities or they pass laws stripping local governments of authority like they have done with restrictions on minimum wage hikes in some states. You can't have it both ways. These cities have a right to govern how they see fit, unless they are violating civil rights, which they are not. The federal government CAN withhold funds but I don't believe they SHOULD withhold funds for something like this.