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.

The Justice Department sued the state of Illinois and the city of Chicago on Thursday, seeking to block state and local protections for undocumented immigrants that the Trump administration says are impeding federal immigration enforcement efforts.

The suit asserts that sanctuary laws in Chicago, Cook County and Illinois have obstructed federal efforts to enforce immigration policy.