NEW : Obama says plan seeks to halt weapons from entering Mexico from U.S . The president said the U.S. will work with its allies in Latin America and elsewhere "to stop terrorists who threaten our people or those of our allies." A prominent Washington-based gun control advocacy group released a report Tuesday backing Calderon 's assertions regarding weapons trafficking . Gun control advocacy group says Mexican drug gangs exploit weak U.S. gun laws .
NEW : Obama says plan seeks to halt weapons from entering Mexico from U.S . The president said the U.S. will work with its allies in Latin America and elsewhere "to stop terrorists who threaten our people or those of our allies." Gun control advocacy group says Mexican drug gangs exploit weak U.S. gun laws .