In a fiery annual address delivered on Sunday to thousands of supporters in Mexico City's central square, President Claudia Sheinbaum launched one of the most direct verbal attacks on the United States by a Mexican leader in decades. Accusing the White House of a concerted effort to undermine her government ahead of the 2027 mid-term elections, Sheinbaum proclaimed that "Mexico is not anyone's piñata," a declaration of sovereignty aimed squarely at Washington. The speech seems to be the culmination of weeks of escalating tensions triggered by a fatal car accident involving CIA agents, a sweeping indictment of a sitting governor, and the passage of a controversial new election law.
At the heart of Sheinbaum's accusations is a new constitutional amendment, championed by her ruling Morena party, which passed the Senate on May 29, 2026, and now awaits ratification by state legislatures. The reform expands the grounds for annulling election results to include "foreign interference," defined broadly as "illicit financing, propaganda, the systematic dissemination of misinformation, digital manipulation, and the intervention of foreign governments or agencies." For Sheinbaum, the bill is a necessary shield against a looming threat. On Thursday, May 28, she held a news conference to show its urgency, telling reporters that "all Mexicans should agree that there should be no foreign interference in elections in Mexico. We must all agree that in Mexico, we Mexicans decide who governs us." The comments came just hours after US President Donald Trump was quoted by Mexican media as suggesting that "Mexico needs a government that will work with us", a remark interpreted by many in Mexico City as a veiled threat to interfere in the 2027 mid-terms.
Critics, however, argue the bill is a tool for political control rather than a safeguard of democracy. With Morena controlling 24 of Mexico's 32 state legislatures, ratification is all but assured. Opponents charge that the amendment's language is so vague that virtually anything, a critical foreign news article, a statement from a US official, or an NGO report could be used to annul an election. "This is one of the most egregious, alarming and retrograde pieces of legislation in Mexico's young democratic history," wrote Arturo Sarukhan, a former Mexican ambassador to the US, on social media. "This law doesn't prevent foreign interference. It hands the government a veto over election outcomes it doesn't like." Political analyst Carlos Bravo Regidor added: "If Morena wanted, they could allege foreign intervention and the court would rule in their favor."
The turning point in the diplomatic relationship came on April 19, 2026, a date Sheinbaum cited in her speech as the moment the "attacks intensified." On that Sunday, two US officials were killed in a car crash in the remote, mountainous terrain of Chihuahua state in northwestern Mexico. The car, which also carried two members of the Chihuahua State Investigation Agency (AEI), veered off a mountain road and fell into a ravine, exploding on impact. The US embassy initially described the two Americans as "embassy personnel," but Mexican officials swiftly demanded answers. It soon emerged, and was later confirmed by multiple US media outlets that the two men were active CIA agents working on a counter-narcotics mission. They had been returning from an operation to destroy clandestine methamphetamine labs in the Sierra Tarahumara when the accident occurred.
For the Sheinbaum administration, the implications were immediate and alarming. Foreign agents may not operate on Mexican soil without prior authorisation from the federal government. Neither Sheinbaum nor her top security officials had been informed of the operation. On April 25, Mexico's security ministry delivered its findings, stating that immigration records showed one of the agents had entered the country as a "visitor" while the other travelled on a diplomatic passport. "Neither had formal accreditation to participate in operational activities within national territory," the ministry declared. "There are no joint operations on land or in the air," Sheinbaum insisted. The government ordered a full investigation into the incident, summoning Chihuahua Governor Maru Campos to testify as a witness before the Attorney General's Office. The probe examined whether state authorities had allowed US intelligence operatives onto Mexican soil without federal approval, a violation of the constitution.
The investigation into the CIA operation had barely begun when Washington struck again. On April 29, just ten days after the crash, the US Department of Justice unsealed a sweeping indictment charging ten current and former Mexican officials with drug trafficking and weapons offences. The highest-profile name on the list was Rubén Rocha Moya, the sitting governor of Sinaloa, a member of Sheinbaum's Morena party and a close ally of former president Andrés Manuel López Obrador. The US requested his immediate extradition, along with that of the mayor of Culiacán, a Sinaloan senator, and several former law enforcement officers. The indictment alleged that Rocha had conspired with the sons of Joaquín "El Chapo" Guzmán to win the 2021 governor's race in exchange for giving the cartel free rein in the state. Rocha, who has since stepped down from his post, vehemently denied the charges, calling them an "attack against the Morena movement."
Sheinbaum publicly affirmed her belief in Rocha's innocence, telling reporters that the extradition request lacked sufficient evidence. "Under no circumstances are we going to permit the intrusion or interference of a foreign government in the decisions that belong exclusively to the people of Mexico," she stated. Her government demanded "overwhelming and irrefutable proof" before moving against Rocha or the other officials. The stance marked a sharp departure from Mexico's recent history of extraditing cartel figures. Over the previous 15 months, Mexico had handed over 92 individuals to the US without judicial process. But as Marco Antonio Avilés, a Mexico City lawyer and extradition expert, noted: "For everyone else, there has always been a very low standard to meet the evidence requirement. But in this case, they raised it to the maximum."
Beyond the legal battlefield, Sheinbaum has accused the United States of waging a shadow war of disinformation designed to destabilise her government. In her address, she alleged that "Mexican and foreign conservative groups were driving a campaign against her administration through global information platforms, algorithms, paid bots, and fake accounts." The goal, she argued, is to weaken her politically ahead of the 2027 mid-term elections, in which Morena faces the prospect of losing its legislative supermajority. The allegations are not without precedent. During the 2024 Mexican elections, US intelligence agencies detected a significant disinformation campaign originating from outside the country, much of it aimed at shaping public opinion against the leftist Morena party. Sheinbaum implied that the same forces are at work again, only now with the apparent blessing of sectors of the US far right.
The White House has dismissed the accusations as baseless. President Trump, for his part, has denied any personal role in a campaign against Mexico, telling reporters that his administration seeks only a mutually respectful relationship. Yet Sheinbaum has been careful to distinguish between Trump and what she calls the "far right sectors" around him. In a press conference on the same day as her address, she stated, "I do not believe it is President Trump who has led this offensive on various issues." Instead, she pointed to "those around him," including officials such as Homeland Security Secretary Markwayne Mullin and Drug Czar Sarah Carter, whose recent visits to Mexico have raised tensions.
Despite the heated rhetoric, both sides have an interest in avoiding a total rupture. Mexico is the United States' largest trading partner, and cooperation on migration, fentanyl interdiction, and border security remains essential for both nations. Sheinbaum herself has emphasised her commitment to dialogue, describing her recent phone call with Trump as "cordial and excellent." On the very day of her speech, the two governments were engaged in trade talks, and Mexican security forces delivered a major victory by killing the leader of the Jalisco New Generation Cartel, a sign that cooperation on security remains possible.