Down in Mexico, President Andres Lopez-Obrador has confirmed what most of us knew. Here is the story: The Mexican president says his country has proof that illegal shipments of the powerful opioid drug fentanyl are arriving from China.A container with hidden packages of the drug was intercepted in the Pacific port of Lázaro Cárdenas, President Andrés Manuel López Obrador said."We already have proof," he said, adding that he would ask the Chinese government to help stop the shipments.US authorities say fentanyl is now the main driver of US drug overdose deaths.In March President López Obrador said he had written to...