The Justice Department on Thursday sued Illinois and Chicago, accusing the state and city of impeding the Trump administration’s immigration efforts with so-called “sanctuary city” laws, as the U.S. carries out what President Donald Trump said would be the “largest deportation operation” in its history.

U.S. officials say the first military aircraft carrying detained migrants to Guantanamo Bay is expected to depart on Tuesday.

As tents went up in Guantanamo Bay, Cuba to hold migrants, attorneys at the Department of Homeland Security and Pentagon were still trying to determine whether it was legal to take the unprecedented step of flying migrants from the US southern border to the facility,