What is a 'sanctuary city' and what are Trump's plans for them?

Mayor Kenney on radio: Pot should be legal, sold at state-run liquor stores

Democratic mayors of major U.S. cities that have long had cool relationships with federal immigration officials say they will do all they can to protect residents from deportation, despite President-elect Donald Trump's vows to withhold potentially millions of dollars in taxpayer money if they do not cooperate.