Mexican President Felipe Calderon said in an interview Friday that last month’s massacre of 72 migrants doesn't undermine Mexico's moral authority to demand better treatment for its own migrants. "Of course we have the moral authority, because Mexican officials are not shooting Central American youths at the border, but U.S. agents are shooting Mexican migrants," Calderon said in an interview with the Spanish-language Univision network. "If we are talking about responsibility, at the root of this, in the case of immigration, is the lack of immigration legislation in the United States that would recognize this phenomenon," Calderon said.