The US indicted a Mexican governor for drug trafficking, dealing a blow to Mexico’s governing party and risking a major diplomatic rift.

Washington accused Rubén Rocha Moya and other officials, including a senator, of protecting the Sinaloa Cartel in exchange for bribes and electoral support. The indictment puts Mexican President Claudia Sheinbaum in a bind: Failing to arrest and extradite Moya, a member of her party, risks renewed accusations from US President Donald Trump that she is weak on crime at a time when the countries are reviewing a key trade agreement.

But a legal case against Moya could expose ties between her party and Mexico’s cartels, kneecapping her domestic standing.