NEW : U.S. says additional U.S. troops at border should battle organized crime , not illegal immigration . The Mexican Embassy issued a statement later Tuesday saying the additional National Guard troops should help prevent the illegal flow of weapons and cash into Mexico . Obama to send more than 6,000 more Customs troops to help with anti-drug and intelligence efforts . `` It 's simply not enough , '' Sen. Gabrielle Giffords says . Previous border operation that sent more than 6,000 troops to the region ended in Tuesday .
NEW : U.S. says additional U.S. troops at border should battle organized crime , not illegal immigration . Obama to send more than 6,000 more Customs troops to help with anti-drug and intelligence efforts . `` It 's simply not enough , '' Sen. Gabrielle Giffords says . Previous border operation that sent more than 6,000 troops to the region ended in Tuesday .