A federal judge is hearing closing arguments over whether to stop construction indefinitely at an immigrant detention center in the Florida Everglades dubbed “Alligator Alcatraz.”

Environmentalists and the Miccosukee Tribe are urging U.S. District Judge Kathleen Williams to issue a preliminary injunction halting operations and construction at the site.

The fate of a makeshift immigrant detention center in the Florida Everglades dubbed “ Alligator Alcatraz ” hung in the balance on Wednesday as a federal judge considered whether building on sensitive wetlands violated environmental laws.