Mexico Demands Proof from US Over Alleged Border Shooting That Triggered Troop Buildup

Mexican President Claudia Sheinbaum has formally requested that the United States hand over any evidence supporting its claim that shots were fired from Mexican territory at American security personnel along the shared border, saying her government has found nothing to corroborate the allegation.

Speaking at her regular morning press conference on Monday, Sheinbaum stated that Mexico has received no proof of the incident and that its own security forces detected no gunfire originating from Mexican soil toward the United States. She explained that the National Guard, the Army and the Navy had all been checked, and none reported any shots coming from Mexico's side of the frontier.

The demand follows public comments by US Ambassador to Mexico Ronald Johnson, who wrote on the social media platform X that a shooting had taken place in late September in Texas, directly across from the Mexican state of Tamaulipas. According to Johnson, the intended targets were members of the US Coast Guard, and he vowed that the threat would be met with a swift response.

Johnson added that the US Embassy in Mexico was working to coordinate with Mexican forces being sent to the border zone where the Coast Guardsmen reportedly came under fire. He said the two countries intended to patrol both sides of the border together, protect their communities, and make it harder for criminal and terrorist organizations to operate in the area.

In the wake of the allegation, roughly 500 US troops have been dispatched to the border region, accompanied by helicopters, drones and equipment designed to counter hostile unmanned aircraft. Mexico has likewise deployed its own personnel to the area as part of a joint effort known as Operation Mirror, which both governments describe as a mechanism for securing the frontier.

Sheinbaum confirmed during the news conference that the Mexican deployment was intended to prevent any complications from arising. Her comments underscore the delicate balance her administration is trying to strike: cooperating with Washington on security matters while pushing back against what she views as unilateral American actions that impinge on Mexican sovereignty.

The relationship between Sheinbaum and Johnson has been strained for months. A former US Army Green Beret who later worked for the Central Intelligence Agency, Johnson has served as ambassador since May 2025 under President Donald Trump. During their overlapping tenures, the two have clashed repeatedly over border security and the limits of foreign involvement in Mexican domestic affairs.

Since returning to the White House for a second term, Trump has pursued a more aggressive posture toward Latin America under a policy informally called the Donroe Doctrine — a play on the 19th-century Monroe Doctrine. His administration has framed its expanded regional role as a campaign against narcotics trafficking and criminal networks, but critics say it blurs the line between law enforcement cooperation and military intervention.

Trump has said on multiple occasions that he might order military strikes inside Mexico targeting drug cartels, which he claims are effectively running the country. Sheinbaum has countered that any such operation would constitute a violation of Mexico's sovereignty and has rejected the premise that American forces could act unilaterally on Mexican territory.

Tensions with the Trump administration have also colored Sheinbaum's dealings with Johnson personally. The Mexican president has accused the ambassador of exceeding the normal boundaries of diplomatic conduct, while Johnson has pressed Mexico to fall in line with Trump's security demands. In June, Johnson publicly criticized Sheinbaum's government for treating the fight against cartels as a political dispute, prompting Sheinbaum to respond the following day with a reminder that ambassadors must respect the internal political affairs of their host countries.

The friction extends beyond rhetoric. On Monday, Sheinbaum raised objections to Johnson's announcement of an international police academy in the central state of Queretaro, noting that her government had not been informed in advance. She questioned how a groundbreaking ceremony could include a US ambassador and a Mexican governor while omitting the federal security cabinet, which under Mexican law must approve any activities by foreign forces on national soil.

That constitutional requirement was tested earlier this year when two CIA agents were reportedly killed in an April car crash in the northern state of Chihuahua alongside local law enforcement officers. What the agents were doing there has never been fully clarified. Some reports suggested they may have taken part in a state-led raid on a drug laboratory without federal authorization, while a state official publicly denied that account and said the agents were conducting unrelated drone training. Sheinbaum said neither she nor her cabinet had been informed of any CIA operations, and her government pledged to investigate.

While US and Mexican law enforcement agencies have a long history of joint counter-narcotics work, Trump's militarized approach has introduced new friction with left-wing governments across the region, Mexico among them. The standoff over the alleged border shooting has become the latest flashpoint in that broader struggle over how far Washington can go in pursuing its security priorities — and how far Mexico is willing to let it.