Mexican Envoy Defends Claim That Most Guns in Mexico Come From U.S. Mexican Envoy Auturo Sarukhan defended his claim Sunday that 90 percent of the weapons intercepted in Mexico come from the U.S. Auturo Sarukhan , the Mexican ambassador to the United States , repeated and defended his claim that 90 percent of the weapons intercepted in Mexico come from the U.S. During an appearance on CBS ' " Face the Nation " Sunday , Sarukhan said on the Arizona and Texas borders with Mexico alone , roughly 7,000 licenses for federal firearms had been granted .