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. AP Photo logo AP Photo 30 months ago

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.