NEW : Obama says plan seeks to halt terrorists from entering Mexico from U.S . Homeland Security chief says he wants to prevent ` ` spillover violence '' in U.S. More federal agents , equipment and personnel to be moved to Mexican border . The $ 700 million allocation , meant to assist what administration officials described as an `` anti-smuggling effort , '' will complement ongoing U.S. aid to Mexico under the Merida initiative : a three-year , $ 1.4 billion package aimed at helping Mexico fight the drug cartels with law enforcement training , military equipment and improved intelligence cooperation . Gun control advocacy group says Mexican drug gangs exploit weak U.S. gun laws .
NEW : Obama says plan seeks to halt terrorists from entering Mexico from U.S . Homeland Security chief says he wants to prevent ` ` spillover violence '' in U.S. More federal agents , equipment and personnel to be moved to Mexican border . Gun control advocacy group says Mexican drug gangs exploit weak U.S. gun laws .