National LGBT legal groups enlisted three of Big Law’s leading appellate firms to oppose the Trump administration’s ban on transgender military members at the U.S. Supreme Court.

Three cases are pending in which the U.S. Justice Department has asked the Supreme Court to overturn injunctions that blocked the Trump administration from implementing the new rules. The justices are scheduled to look at the petitions—arising from Washington, D.C., California and Washington state—next week at their Jan. 11 conference.