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.

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.

A federal judge is expected to rule next week on whether to extend a temporary pause on new construction at the site of an immigration detention facility built in the Florida Everglades.