U.S. As Amicus Argues Derivative Sovereign Immunity Is Defense, Not Immunity

( September 24, 2025, 2:07 PM EDT) -- WASHINGTON, D.C. — The United States filed a motion to participate in oral argument and an amicus curiae brief in the U.S. Supreme Court supporting a detainee class which argues GEO Group Inc. has failed to show that a ruling against it when it sought to assert a defense under Yearsley v. W.A. Ross Construction Co. is immediately appealable....