Late Thursday night, U.S. District Judge Kathleen Williams issued an 82-page ruling that prohibits the state from admitting new detainees to the site and requires officials to begin tearing down parts of the hastily constructed tent city.
The decision marks a major blow for Gov. Ron DeSantis and President Donald Trump, who touted the project as a model for other states.
The ruling came in response to a federal lawsuit filed by Friends of the Everglades and the Center for Biological Diversity, who challenged federal, state, and Miami-Dade County officials ahead of Alligator Alcatraz's opening, arguing the project skipped federally required environmental review and denied the public a chance to weigh in.
"Here, there weren't 'deficiencies' in the agency’s process," Williams said in her ruling (attached at the bottom of this story). "There was no process."

President Donald Trump tours the immigration detention center known as Alligator Alcatraz.
Photo by Daniel Torok via Flickr/theWhiteHouse