Mexico’s Senate has approved a constitutional reform that would require people seeking the country’s top executive offices to hold only Mexican nationality.

The measure, approved by the Senate on September 29, 2026, would affect the presidency, state governorships and the head of government of Mexico City. It still needs approval from a majority of Mexico’s state legislatures before it can become part of the Constitution.

Senate Approves Single-Nationality Requirement

The reform was approved by Mexico’s Senate with 86 votes in favor and 42 against. It was introduced by President Claudia Sheinbaum’s government as an effort to establish exclusive Mexican nationality requirements for the country’s highest executive positions.

Under the proposed constitutional changes, individuals seeking these offices who hold another nationality would have to renounce it before registering as candidates.

The reform would also impose restrictions on officeholders during their terms. Those covered by the measure would not be permitted to acquire or request another nationality, use a foreign passport or identity document, exercise political rights associated with another citizenship, or seek diplomatic protection from another country.

Offices Covered by the Reform

If approved through the remaining constitutional process, the new requirements would apply to:

• President of Mexico
• Governors of Mexico’s 31 states
• Head of Government of Mexico City

The reform is expected to apply beginning with the 2028 electoral process.

Reform Still Requires State Approval

Senate approval does not by itself complete the constitutional amendment process. Under Mexico’s Constitution, constitutional reforms must also receive approval from a majority of state legislatures before the amendment can be formally declared and published.

The proposal will therefore move to the states for consideration.

The reform has generated debate over Mexico’s rules concerning dual nationality and eligibility for senior public office. Supporters of the measure have argued that people holding the highest executive positions should have an exclusive legal and political connection to Mexico, while its opponents have questioned the need for additional restrictions on dual nationals.

For now, the Senate vote represents an important step, but the proposed single-nationality requirement will not take effect unless the remaining constitutional requirements are completed.