Curbing violence government's "principal challenge," says Mexican president

A supporter of Mexican President Andres Manuel Lopez Obrador holds a poster with his image during a ceremony marking his first full year in office in Mexico City, capital of Mexico, on Dec. 1, 2019. Decreasing Mexico's high rates of violent crime is the government's main challenge, President Andres Manuel Lopez Obrador said on Sunday. (Photo by David de la Paz/Xinhua)