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.

Last week, US District Judge Kathleen Williams ordered a 14-day halt on additional construction at the site while witnesses testified at a hearing, part of a lawsuit seeking to halt operations and further construction.