Friends of the Everglades, Inc. v. Secretary of the U.S. Department of Homeland Security

Court of Appeals for the Eleventh Circuit·Decided April 21, 2026·No. 25-12873·Published

Opinion

USCA11 Case: 25-12873 Document: 139-1 Date Filed: 04/21/2026 Page: 1 of 38

FOR PUBLICATION

In the

United States Court of Appeals For the Eleventh Circuit

No. 25-12873

FRIENDS OF THE EVERGLADES, INC., a Florida 501(c)(3) not-for-profit corporation, CENTER FOR BIOLOGICAL DIVERSITY, a 501(c)(3) nonprofit organization, Plaintiffs-Appellees,

MICCOSUKEE TRIBE OF INDIANS OF FLORIDA, Plaintiff-Intervenor-Appellee, versus

SECRETARY OF THE UNITED STATES DEPARTMENT OF HOMELAND SECURITY, ACTING DIRECTOR, OF THE UNITED STATES IMMIGRATION AND CUSTOMS ENFORCEMENT, EXECUTIVE DIRECTOR, OF THE FLORIDA DIVISION OF EMERGENCY MANAGEMENT, Defendants-Appellants,

USCA11 Case: 25-12873 Document: 139-1 Date Filed: 04/21/2026 Page: 2 of 38

2 Opinion of the Court 25-12873

MIAMI-DADE COUNTY, a political subdivision of the State of Florida, Defendant.

Appeals from the United States District Court for the Southern District of Florida D.C. Docket No. 1:25-cv-22896-KMW

Before WILLIAM PRYOR, Chief Judge, and BRASHER and ABUDU, Circuit Judges. WILLIAM PRYOR, Chief Judge:

This appeal requires us to decide if the National Environmental Policy Act governs a facility constructed by the State of Florida to assist in federal immigration enforcement. Using state employees and state funds, Florida officials, on their own initiative, constructed a detention center at an airport on state property in the Florida Everglades. After federal authorities inspected the facility for compliance with federal standards, they started using it as a detention facility. Environmental advocates, joined by the Miccosukee Tribe, sued state and federal officials for failing to conduct an environmental review under the Act. The district court preliminarily enjoined the officials to stop construction and to undo some of the work that had already been completed, and it enjoined the detention of illegal aliens there. Because the environmentalists and Tribe failed to prove either a final agency action or federal control, and because the injunction, in part, violates a statutory prohibition of enjoining immigration enforcement, we vacate and remand.

25-12873 Opinion of the Court 3

I. BACKGROUND

On January 6, 2023, Governor Ron DeSantis of Florida declared a state of emergency. He stated that “alarming levels” of illegal immigration in Florida in preceding months had imposed “an unmanageable strain on local resources.” He designated the Executive Director of the Division of Emergency Management to coordinate the response to the crisis. And he instructed the Director to “[s]eek direct assistance and enter into agreements” with the federal government to address the crisis and direct state and local governmental agencies to respond to the emergency.

Before 2025, the Dade-Collier Training and Transition Airport was a small airport in Big Cypress National Preserve in the Florida Everglades. On June 23, 2025, the Director used his emergency powers to commandeer the airport. The Director planned to build a temporary immigration detention facility on the site, called the South Florida Soft-Sided Facility South.

State officials constructed the facility using state funds. Immigration and Customs Enforcement officials completed a “postconstruction compliance check” to ensure that the site meets federal standards for immigration detention. Florida officials planned to “seek reimbursement of its expenses from the federal government ,” but when the district court entered its injunction, Florida had received no federal funding.

Florida manages the facility using state law enforcement officers . Several state agencies have agreements with the federal government allowing them to assist in immigration enforcement.

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These section 287(g) agreements allow the Secretary of Homeland Security to delegate immigration enforcement to state and local agencies. See 8 U.S.C. § 1357(g). Under the agreements, state and local authorities may “perform a function of an immigration officer ,” such as investigating, detaining, or transporting aliens. Id. § 1357(g)(1). When doing so, state and local authorities act subordinately to federal officials. Id. § 1357(g)(3). Federal immigration officials transport detainees to the facility. They turn the aliens over to state officials who have the discretion to decide “who is detained at th[e] facility.” Although hundreds of state officials and contractors were onsite every day when the district court entered its injunction , only four federal officers were present to coordinate the transportation and detention of aliens.

On June 27, 2025, two environmental advocacy groups, Friends of the Everglades and the Center for Biological Diversity, sued the Secretary of Homeland Security, the Director of Immigration and Customs Enforcement, the Executive Director of the Florida Division of Emergency Management, and Miami-Dade County in the Southern District of Florida. Friends is a nonprofit organization with more than 50,000 members. The Center “is a national, nonprofit conservation organization” with more than 93,000 members nationwide. Their complaint alleged that the state and federal defendants violated the Administrative Procedure Act by constructing an immigration detention center without assessing its environmental impact under the National Environmental Policy Act and violated state law. The environmentalists moved for a temporary restraining order and a preliminary injunction. On July 15, the

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Miccosukee Tribe of Indians of Florida, which has a reservation near the facility, moved to intervene as a plaintiff. Its complaint alleged a nearly identical claim under the Environmental Policy Act along with two other claims. The district court granted the Tribe’s motion.

The district court issued a preliminary injunction against the officials. It ruled that the environmentalists and Tribe were likely to succeed on the merits. It first concluded that venue was proper in the Southern District of Florida. It then decided that construction of the facility without performing an environmental analysis was a final agency action under the Administrative Procedure Act and a “major federal action” under the Environmental Policy Act. It ruled that federal officials exercised substantial control over the facility and committed to fund it. It reasoned that the officials’ undisputed failure to comply with the Environmental Policy Act meant that the environmentalists and Tribe were likely to succeed on the merits. The district court also ruled that the environmentalists and Tribe were likely to suffer irreparable harm and that the environmental harm outweighed any benefits the officials received from detaining aliens at the facility.

The district court enjoined the officials from “installing any additional industrial-style lighting . . . or doing any paving, filling, excavating, or fencing; or doing any other site expansion.” It also prohibited them from “bringing any additional persons onto the . . . site who were not already being detained” there. Without the addition of new detainees and with the “population attrition” of

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the current detainees, the district court assumed the “camp’s population ” would “programmatic[ally]” fall and gave the officials 60 days to remove “temporary fencing,” “lighting fixtures,” and “all generators, gas, sewage, and other waste and waste receptacles that were installed to support this project.” A motions panel stayed the injunction and the underlying action pending this appeal.

II. STANDARDS OF REVIEW

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