Juan Orlando Hernndez, whom Mr. Trump called a victim of persecution, helped orchestrate a decades-long trafficking conspiracy. It ravaged his Central American country. He once boasted that he would "stuff the drugs up the gringos' noses." He accepted a $1 million bribe from El Chapo to allow cocaine shipments to pass through Honduras. A man was killed in prison to protect him. Last year, Mr. Hernndez was convicted on drug trafficking and weapons charges and sentenced to 45 years in prison. It was one of the most sweeping drug-trafficking cases to come before a U.S. court since the trial of the Panamanian strongman Gen. Manuel Noriega three decades before. But on Friday, President Trump announced that he would pardon Mr. Hernandez, 57, who he said was a victim of political persecution, though Mr. Trump offered no evidence to support that claim. It would be a head-spinning resolution to a case that for prosecutors was a pinnacle, striking at the heart of a narcostate.