Armed federal agents, contractors enter Tohono O’odham Nation land for border wall-related drilling

For Tucson residents who travel through southern Arizona, work in border communities or follow the region’s water, wildlife and tribal sovereignty issues, the confrontation on Tohono O’odham Nation land raises immediate questions about who controls activity on the reservation and how border security projects will proceed. The Nation says about 20 masked, armed Customs and Border Protection agents escorted Department of Homeland Security contractors onto tribal property Tuesday, where crews began drilling and other preliminary work at three sites near the U.S.-Mexico border.

The contractors used drill trucks to collect soil samples and conduct related pre-construction activities, according to a statement from the Tohono O’odham Nation. The work was not described as the construction of a wall itself, but the Nation characterized it as border wall-related activity. The presence of armed federal personnel turned what might otherwise have been a survey operation into a direct dispute over tribal authority, federal border policy and the future of land along the international boundary.

The Nation said the CBP contingent included a BORTAC SWAT team and that Bureau of Indian Affairs law enforcement officers were also present. Mexican police were reportedly positioned on the south side of the border while border wall contractors worked there in coordination with U.S. authorities. The combined deployment extended across both sides of the boundary, according to the Nation’s account, while contractors carried out work at three locations on tribal land.

Tohono O’odham Police Department officers went to those sites to document what was happening and help prevent the situation from escalating. Tribal officials said they had previously warned unauthorized people entering Nation property that they would be trespassing. However, the Nation said its officers could not issue citations to the contractors without creating a risk of further confrontation. The Nation urged residents to stay alert, avoid escalation and put their personal safety first while tribal leaders work to address the dispute.

Chairman Verlon M. Jose said the federal deployment threatens a longstanding working relationship between the Nation and federal agencies on border protection. He described the appearance of BIA law enforcement and the BORTAC team on tribal land as deeply troubling. In his view, continued federal investment in border walls could damage the environment, affect sacred places and separate families whose connections cross the international boundary.

The dispute comes as border wall work continues to draw attention in protected desert areas of southern Arizona. A related development involved bulldozers moving into desert near Quitobaquito Springs as another section of border wall advanced. The supplied reports did not provide additional details about that project, but the reference places the Nation’s concerns within a broader push to expand or extend border infrastructure across environmentally sensitive land near the Arizona-Mexico border.

The federal government’s actions also drew criticism from Arizona’s congressional delegation. Rep. Adelita Grijalva said there was no justification for armed federal agents and contractors to enter tribal land and begin work without the Nation’s approval. She called for an immediate stop to the unauthorized activity and said the federal government must honor the Nation’s laws, sovereignty, sacred sites and ancestral lands. Grijalva also said she would work with tribal leaders on legal and legislative measures intended to block additional unauthorized activity.

Sen. Ruben Gallego likewise called for the work to stop and accused the Trump administration of failing to respect tribal sovereignty. He said the Department of Homeland Security had previously been warned that meaningful consultation with tribes was necessary before border infrastructure could be built on their land. Instead, he said, federal authorities escalated the dispute by sending armed agents onto the Nation without advance notice. Gallego argued that border security and tribal sovereignty can coexist, but said the current operation failed to uphold both.

The Nation’s leaders say the episode could undermine decades of cooperation between tribal and federal authorities in securing the border. For communities across the Tucson region, the conflict highlights the practical consequences of border policy beyond the construction zone itself, including the protection of sacred sites, environmental concerns and the ability of tribal police to enforce Nation law. The immediate next step described by the Nation is continued work by tribal officials to resolve the situation, while its police document activity and residents are asked to remain vigilant and avoid confrontation.