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Construction work is conducted at Mariscal Mountain in Big Bend Naitonal Park

Construction of the Trump administration's border barrier project procedes at Mariscal Mountain in Big Bend National Park in Texas on August 15, 2026.

(Photo by Laiken Jordah/Clenter for Biological Diversity)

Conservationists Vow Court Fight as DHS Lifts Pause on Big Bend Border Construction

"We won't let them destroy the wildest place in Texas without a fight," the Center for Biological Diversity vowed.

The Trump administration on Wednesday allowed a temporary pause on border construction in and around Big Bend National Park in Texas to expire, prompting renewed vows from conservationists and other opponents to fight the contentious project in court.

Laiken Jordahl, the national public lands advocate at the Center for Biological Diversity (CBD), posted a court document stating that US Customs and Border Protection (CBP)k "will lift the pause on ground-disturbing activities" related to the Department of Homeland Security's (DHS) plan to build border barriers and other destructive infrastructure across one of the most remote and environmentally sensitive stretches of the US-Mexico border.

The government said Tuesday in a court filing that CBP is “actively considering adjustments” to the project “that would reduce its scope and avoid or minimize potential impacts, based on input received from the National Park Service and other stakeholders."

However, those possible changes did not assuage opponents of the project, who span the political spectrum.

“We are disappointed, and urge the Department of Homeland Security to extend this pause,” Emily Thompson, executive director of the Coalition to Protect America’s National Parks, said Wednesday. “Continuing with construction of border barriers, roads, and associated infrastructure inside Big Bend National Park will do unprecedented damage to the park.”

Thompson continued:

Big Bend National Park stands out for its unique desert landscape. With more nesting bird species than any other national park, towering canyon walls, and the largest international dark sky reserve in the entire world, Big Bend is an integral addition to our nation’s natural heritage. The Trump administration's plan to build a border wall through the park threatens all of this, heightening flood risk, inundating the skies with lights, and cutting off migration patterns for wildlife. Building in Big Bend would be mutilating an extraordinary landscape at a massive cost to the taxpayer—with little ultimate benefit.

Bob Krumenaker, chair of Keep Big Bend Wild and a former Big Bend National Park superintendent, asserted that “border security already works" in the park "without the need for intrusive construction."

"The Border Patrol, the National Park Service, and local sheriffs already operate an effective surveillance system with ground and aerial patrols and unobtrusive, wireless sensors," he noted. "The rugged terrain, huge distances, and harsh desert weather in the national park and in Mexico across the Rio Grande make this the least active section of the entire southern border for illegal crossings."

CBD and other plaintiffs are already seeking a preliminary injunction in federal court. US District Judge Kathleen Cardone—an appointee of former President George W. Bush—is scheduled to hear testimony and evidence Friday in El Paso on the request to halt construction while the groups' lawsuit proceeds. The plaintiffs argue that the Trump administration unlawfully waived dozens of federal laws to accelerate construction.

Indigenous peoples and their advocates have criticized DHS for waiving laws, including the Native American Graves Protection and Repatriation Act and the Archaeological and Historic Preservation Act, to enable the project's construction.

In a statement issued Wednesday, CBD described some of the damage already done by construction in service of Trump's deadly immigration crackdown:

Bulldozers started tearing into Big Bend National Park near the iconic Santa Elena Canyon in early August and were documented plowing new routes for vehicle barriers into both the east and west sides of Mariscal Mountain. Contractors have stockpiled heavy equipment across the Big Bend region, where staging yards have been cleared, worker camps built, and water wells drilled.

"We'll be in court... in El Paso demanding a permanent halt to the destruction," CBD said. "We won't let them destroy the wildest place in Texas without a fight.

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