The federal lawsuit is the first by Trump's Justice Department against states or municipalities that have sanctuary city policies.

Federal officials are asking a judge to bar the Illinois, Chicago, Cook County and the Cook County Sheriff from using local laws that protect migrants to hamper law enforcement.

President Donald Trump’s administration went to court Thursday to challenge sanctuary policies in the state of Illinois, Cook County and the city of Chicago that limit the powers of state and local police to assist federal law enforcement on immigration-related matters.