Mexico's ruling Morena pivots to anti‑U.S. sovereignty rhetoric ahead of 2027 elections

Former president Andrés Manuel López Obrador circulated a letter backing President‑elect Claudia Sheinbaum and denouncing recent statements by U.S. President Donald Trump. The document framed U.S. pressure as an invasion of Mexico’s sovereignty and was presented as the core of a new campaign strategy for Morena, aiming to unite the party’s base and deflect criticism ahead of the 2027 electoral contest.

PRI national leader Alejandro Moreno responded on social media, calling López Obrador “cowardly” and accusing him of corruption, narco‑politics and collusion with organized crime. Moreno argued that bilateral issues with the United States should remain state matters, not personal disputes. The exchange has intensified partisan debate over foreign influence, Morena’s internal discipline, and the party’s ability to sustain its 4‑T agenda.

The letter and ensuing backlash illustrate how Mexican political actors are using nationalist rhetoric to shore up support while confronting accusations of impunity and internal factionalism.