It appears to be the first Justice Department lawsuit against local officials for allegedly interfering with the Trump administration’s immigration crackdown.

The Trump administration is suing the city of Chicago, Cook County and the state of Illinois over sanctuary laws that prohibit local law enforcement from aiding U.S. Immigration and Customs Enforcement in arresting undocumented immigrants.

The lawsuit argues that the U.S. Constitution’s Supremacy Clause “prohibits Illinois, Chicago, Cook County, and their officials from obstructing the Federal Government’s ability to enforce laws that Congress has enacted or to take actions entrusted to it by the Constitution.”