How sanctuary cities actually work

"President Trump says he wants to strip funding from so-called "sanctuary cities," but what exactly do these cities do? Subscribe to our channel! http://goo.gl/0bsAjO The map at 4:26 comes from the Immigrant Legal Resource Center (https://www.ilrc.org/local-enforcemen...) Cities and counties that limit their cooperation with federal immigration agents are sometimes called "sanctuaries," but the word doesn't actually have any legal meaning. However, because the constitution prohibits the federal government from making states enforce its laws, cities, counties, and other local jurisdictions have lots of freedom to ignore, or comply with, requests from federal agencies like ICE to detain undocumented immigrants for deportation..."