Claudia Sheinbaum won Mexico’s presidency in a landslide. Her coalition captured both chambers of Congress. She governed with a democratic mandate that was, by all accounts, legitimate. Then she used it to build a mechanism for overturning the next one.

Mexico’s Senate voted 85-42 on Friday to approve a constitutional amendment that allows election results to be annulled on grounds of “foreign interference.” The lower house had already passed it with 307 votes in favor and 128 against. The amendment now heads to Mexico’s 32 state legislatures, where the ruling Morena party controls 24. Ratification is all but certain.

The amendment modifies Article 41 of the Constitution to add foreign interference to existing grounds for nullifying elections — alongside illicit campaign financing, excessive spending, and improper media coverage. The definition of interference is expansive: “illicit financing, propaganda, the systematic dissemination of disinformation, digital manipulation, and the intervention of foreign governments or agencies.” It also covers “acts of political, economic, diplomatic, or media pressure intended to influence public opinion.”

An article in a foreign newspaper. A statement from a US official. A report from an international watchdog. Under the amendment’s language, any of these could, in theory, be cited as evidence.

Who Decides What Counts

Mexico’s electoral court would determine whether foreign interference occurred and whether it rose to the level of warranting annulment. But the court was overhauled under Sheinbaum’s predecessor, Andrés Manuel López Obrador, and is now widely regarded as aligned with Morena.

“If [Morena] wanted, they could allege foreign intervention and the court would rule in their favor,” Carlos Bravo Regidor, a political analyst, told The Guardian. “The truth is, I don’t see any point in [the bill], any merit, any validity. This is an abuse.”

The secondary legislation that would define how foreign interference is actually proven and applied was quietly withdrawn. Morena’s lower house leader, Ricardo Monreal, requested that the implementing rules be pulled, citing insufficient time before legal deadlines tied to the 2027 election cycle. That means the constitutional power exists, but the specific mechanics of its use remain undefined — a loaded weapon with no safety catch.

Sheinbaum acknowledged the gap. “The issue is how you demonstrate that there was, in fact, foreign intervention in an election, and that has to come in the law very clearly,” she said, adding that it must be shown with evidence.

A Tool in Search of a Pretext

The broad language mirrors a pattern visible elsewhere. Governments in Venezuela, Turkey, and Hungary have enacted sweeping national security laws granting authorities power to void or contest electoral outcomes, citing foreign influence. The definitions tend to be elastic. The enforcement tends to be selective.

The stated justification for Mexico’s amendment is not fabricated from nothing. The CIA was recently reported to have agents operating without authorization in the state of Chihuahua. The US Justice Department indicted 10 current and former officials from Sinaloa — including the governor, a close ally of López Obrador — for ties to drug trafficking. Donald Trump has repeatedly threatened military action against Mexican cartels. A Spanish conservative politician toured Mexico earlier this month and compared Sheinbaum’s government to Communist Cuba.

“All Mexicans should agree that there should be no foreign interference in elections in Mexico,” Sheinbaum said. “We must all agree that in Mexico, we Mexicans decide who governs us.”

The sentiment is defensible. The mechanism is not.

What Comes Next

Mexico holds midterm elections in 2027. Morena currently controls the presidency and both chambers of Congress. If the party loses significant ground, the amendment provides a legal avenue to challenge those losses — and the body adjudicating those challenges answers to the party that would benefit.

“This is one of the most egregious, alarming and retrograde pieces of legislation in Mexico’s young democratic history,” said Arturo Sarukhan, a former Mexican ambassador to the US. “This law doesn’t prevent foreign interference. It hands the government a veto over election outcomes it doesn’t like.”

Ricardo Anaya, a senator from the opposition PAN party, was more blunt: “It’s a trap so that Morena can literally annul any election they want.”

The amendment’s supporters frame it as protection of sovereignty. Its text is broad enough to serve as a tool of consolidation. The court empowered to enforce it is not independent. The legislation that might have constrained its application has been shelved.

Mexico’s democratic institutions have been stress-tested before. This amendment adds a new kind of pressure — one where the outcome of an election can be retroactively rewritten, and where the definition of the offense is limited only by the political imagination of those applying it.

Sources