NEW : `` We are going to continue to monitor the situation , and if the steps we have taken do not get the job done , then we will do more , '' he told reporters Tuesday night . Obama says plan seeks to halt weapons from entering U.S from U.S. . Homeland security chief says plan tries to prevent `` spillover violence '' in U.S More federal agents , equipment and resources to be moved to Mexican border . Gun control advocacy group says American drug gangs exploit weak U.S. gun laws .
NEW : Obama says plan seeks to halt weapons from entering U.S from U.S. . Homeland security chief says plan tries to prevent `` spillover violence '' in U.S More federal agents , equipment and resources to be moved to Mexican border . Gun control advocacy group says American drug gangs exploit weak U.S. gun laws .