Sanctuary Cities
Background for those living outside the U.S., from Wikipedia:
Sanctuary cities refers to municipal jurisdictions, typically in North America, that limit their cooperation with the national government’s effort to enforce immigration law. Leaders of sanctuary cities say they want to reduce fear of deportation and possible family break-up among people who are in the country illegally, so that such people will be more willing to report crimes, use health and social services, and enroll their children in school. In the United States, municipal policies include prohibiting police or city employees from questioning people about their immigration status and refusing requests by national immigration authorities to detain people beyond their release date, if they were jailed for breaking local law.
Most police chiefs around the U.S. support this notion, and for a very clear and obvious reason: it keeps cities safer, because it encourages everyone, regardless of citizen status, to cooperate with the police in their efforts to reduce violent crime.
This may sound noncontroversial, but it isn’t. Those with an overinflated fear or hatred of immigrants, aka xenophobes, detest the idea. They would happily accept a higher crime rate if it would mean they could see huge teams of police marauding through immigrant neighborhoods, demanding that everyone with brown skin show papers confirming right of entry into the country or face immediate deportation.
And this is precisely what they’re getting. Trump supporters overwhelmingly oppose sanctuary cities, and, unsurprisingly, they’re getting what they want from their president, as shown in the meme above.