A former Mexican state attorney general could face trial for treason over accusations that he illegally launched a joint operation with the CIA without telling the federal government. The operation to dismantle a drug lab in the state of Chihuahua in northern Mexico in April drew attention after two CIA agents and two state officials died in a car accident on their way back. That raised questions about the Trump administration’s actions on Mexican soil, and outraged President Claudia Sheinbaum, who has made a strong defense of national sovereignty a centerpiece of her administration. The state district attorney, César Jáuregui,...