The Occupational Safety and Health Administration has until 5 p.m. Monday to respond to state attorneys generals’ challenges to the Biden administration’s vaccine mandate that was temporarily halted over the weekend.

At least 27 states, including a group of 11 in the Central and Western portions of the U.S., filed a lawsuit on Friday in the U.S. Court of Appeals for the Eighth Circuit, calling the coronavirus vaccine mandate for private businesses with 100 employees or more unconstitutional.