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.

The Trump administration sued officials in Illinois, Chicago and Cook County on Thursday over policies that limit cooperation with federal immigration enforcement authorities, accusing them of obstructing its immigration crackdown.

Illinois Democratic Gov. JB Pritzker says the state follows the law. President Donald Trump has often singled out Chicago and Illinois, which have some of the strongest sanctuary laws in the U.S.