Homeland Security Secretary Janet Napolitano, left, and Mexican Attorney General Eduardo Medina-Mora Icaza, right, answer questions after they signed a Letter of Intent to develop a coordinated and intelligence-driven response to the threat of cross border smuggling and trafficking of weapons and ammunition, in San Antonio, Thursday, Aug. 13, 2009. Napolitano was in San Antonio to to participate in the U.S. Immigration and Customs Enforcement Border Enforcement Security Task Force Conference.