Mexico's president said on Tuesday he had written to his Chinese counterpart Xi Jinping, urging him to help control shipments of fentanyl as he fended off criticism in the U.S. that Mexico is not doing enough to stop trafficking of the synthetic opioid.
President Andres Manuel Lopez Obrador read out the letter to Xi dated March 22 in which he defended efforts to curb supply of the deadly drug, while rounding on U.S. critics, some of whom want Washington to intervene militarily in Mexico.
