The solutions to sanctuary cities exists.

Many cities in the United States declare themselves "sanctuary cities," where immigrants cannot be asked about the legality of their residence by police, and police cannot report illegal immigrants to Immigration and Customs Enforcement (ICE).  For an incomplete list, by state, go here.

A lot of American citizens--and legal immigrants--are frustrated: aren't their local municipal governments supposed to do the everyday legislative, executive, and enforcement chores to keep them safe?  Why don't their elected officials do what they're supposed to do?  And what can we do about it?

Well, according to Judicial Watch, we do have solutions.  

The policies of sanctuary cities are voided by federal law.  All states must do is enforce the federal laws regarding the communications block that sanctuary city councils have set up between local law enforcement and ICE.  If states were to further criminalize that communications block, and prosecute those that ignored the law--noisily and publicly--I'm betting that sanctuary cities would disappear quickly.

Another option we have is similar to the state laws passed nation wide regarding eminent domain use: any city that abuses the federal law gets defunded by their state.  Totally.  No more funds for highway repairs, education, or any of the other hundreds of projects cities rely on state funds to pay for.  

In any case, we do have options.  All it takes is the political intestinal and testicular fortitude--both on our parts, to demand that our state legislatures do something; and on the parts of our state legislators, to stand up against the identity politics special interest groups.