As all eyes remain on the U.S. war in Iran, another international development may throw a wrench into one of America’s most valuable foreign relationships.

On April 29, the U.S. Justice Department unsealed indictments against 10 current and former Mexican politicians and officials charging them with colluding with the very drug cartels they’re supposed to be combating. One of the men, Rubén Rocha Moya, is the governor of the Mexican state of Sinaloa infamous for the drug-infused violence that many Americans associate with Mexico. The allegations against Moya are especially damning.…