** FILE ** Secretary of Homeland Security Janet Napolitano speaks in El Paso, Texas, on Thursday, March 24, 2011. Napolitano says security on the southern U.S. border is better than ever and that violence from neighbor Mexico hasn't spilled over in a serious way. Secretary Napolitano was joined by U.S. Customs and Border Protection (CBP) Commissioner Alan Bersin and Under Secretary of Commerce for International Trade Francisco Sanchez. (AP Photo/The El Paso Times, Ruben R. Ramirez)

Photo by: RUBEN R RAMIREZ

** FILE ** Secretary of Homeland Security Janet Napolitano speaks in El Paso, Texas, on Thursday, March 24, 2011. Napolitano says security on the southern U.S. border is better than ever and that violence from neighbor Mexico hasn't spilled over in a serious way. Secretary Napolitano was joined by U.S. Customs and Border Protection (CBP) Commissioner Alan Bersin and Under Secretary of Commerce for International Trade Francisco Sanchez. (AP Photo/The El Paso Times, Ruben R. Ramirez)