Sanctuary City is about money

A sanctuary city is a city in the United States or Canada that has adopted a policy of protecting illegal aliens by not prosecuting them solely for violating federal immigration laws in the country in which they are now living illegally. Such a policy can be set out expressly in a law (de jure) or observed only in practice (de facto). The term applies generally to cities that do not use municipal funds or resources to enforce national immigration laws, and usually forbid police or municipal employees to inquire about a person's immigration status. The designation has no precise legal meaning