ORLANDO, Fla. (AP) — Environmental groups on Tuesday asked a federal appellate court panel to drop its temporary halt of a lower court’s order instructing state officials to close an immigration detention center in the heart of the Florida Everglades known as “Alligator Alcatraz.”

The Everglades facility remains open, still holding detainees, because the appellate court in early September relied on arguments by Florida and the Trump administration that the state had not yet applied for federal reimbursement, and therefore wasn’t required to follow federal environmental law.

State officials opened the detention center last summer to support President Donald Trump’s immigration crackdown.

Questions by the three appellate judges during oral arguments in a Miami courtroom focused on how much control the federal government had over the state-built facility and under what circumstances an environmental review was required to be in compliance with federal law. The judges did not indicate when they would rule.

Jesse Panuccio, an attorney for the Florida Department of Emergency Management, told the judges federal funding and federal control of the facility were the two criteria for determining if the federal environmental law would apply and the federal agencies had no control over the state-run detention center.

Florida was notified in late September that FEMA had approved $608 million in federal funding to support the center’s construction and operation.