Mexico Demands Proof of Border Shooting That Triggered US Troop Surge

Mexico has formally requested that the United States hand over evidence supporting its claim that shots were fired from Mexican territory at US security personnel along the shared frontier, according to statements made by Mexican President Claudia Sheinbaum during her daily news conference on Monday.

Sheinbaum told reporters that Washington had reported "shots from the Mexican border," but that her government has been unable to corroborate the account. "We asked for all the evidence because we have no evidence," she said, noting that Mexico's National Guard, Army, and Navy had detected no gunfire originating from Mexican soil toward the United States.

The alleged incident, which US officials say occurred in late September, reportedly took place on the Texas side of the border across from the Mexican state of Tamaulipas. US Ambassador to Mexico Ronald Johnson first disclosed the shooting in a post on the social media platform X a day before Sheinbaum's remarks, describing the targets as members of the US Coast Guard.

Johnson wrote that the threat would be "swiftly addressed" and that the US Embassy in Mexico was helping coordinate with Mexican forces deploying to the border area where the Coast Guardsmen came under fire. He added that the two countries intended to patrol both sides of the border, protect their communities, and make it harder for criminal and terrorist organizations to operate.

In response to the alleged shooting, the United States has deployed roughly 500 troops to the border region, along with helicopters, drones, and anti-drone equipment. Mexico has also sent its own forces to the area as part of a joint operation known as Operation Mirror, which is intended to secure the frontier between the two nations.

Sheinbaum confirmed during Monday's news conference that the Mexican deployment was designed "to forestall any issues" that might arise. Her comments underscore the delicate balancing act her government faces as it seeks to maintain security cooperation with Washington while guarding against perceived infringements on Mexican sovereignty.

The episode has further strained the already complicated relationship between Sheinbaum and Johnson, who has served as US ambassador to Mexico since May 2025 under President Donald Trump. A former US Army Green Beret who later worked for the Central Intelligence Agency, Johnson has repeatedly clashed with Sheinbaum over border security and national sovereignty questions.

Since returning to office for a second term, Trump has pursued a more aggressive posture toward Latin America under a policy informally dubbed the "Donroe Doctrine," a play on the 19th-century Monroe Doctrine. His administration has taken a more active role in regional security, citing the fight against narcotics trafficking and criminal organizations as justification.

Trump has repeatedly suggested he might order military strikes inside Mexico to target drug cartels, which he claims are "running Mexico" and pose a threat to US security. Sheinbaum has warned that any such operation would violate her country's sovereignty, setting up a persistent point of tension between the two governments.

The friction has also played out publicly between Sheinbaum and Johnson. In June, the ambassador criticized her government on social media for turning the "fight against cartels" into a "political dispute." Sheinbaum responded the following day with a pointed warning: "Ambassadors must respect the internal political affairs of their countries."

On Monday, Sheinbaum raised a fresh grievance against Johnson, objecting to his announcement of an international police academy in the central state of Queretaro without her government's knowledge. "How can a groundbreaking ceremony take place with a US ambassador and a Mexican governor, but not with the federal security cabinet?" she asked.

Under Mexico's constitution, the federal government must approve the activities of foreign forces operating on Mexican soil. That requirement was tested earlier this year when two CIA agents were reportedly killed in an April car accident in the northern state of Chihuahua, alongside members of the state's law enforcement.

The circumstances surrounding the CIA agents' presence in Chihuahua remain unclear. Reports suggested the agents may have been participating in a state-led raid on a local drug lab without federal authorization, though one state official publicly denied that account, saying the agents were conducting unrelated training on drone usage.

Sheinbaum said neither she nor her cabinet had been informed of any CIA activities in the country, and her government pledged to investigate the incident. The disclosure added to longstanding concerns in Mexico City about unilateral US security operations conducted without federal approval.

Washington and Mexico City have a long history of cooperation between their law enforcement agencies on counter-narcotics efforts. However, Trump's more militaristic approach to the region has created friction with left-wing governments, including Mexico's, as the two neighbors navigate an increasingly contested security relationship along their shared border.