NEW : Obama said Monday that lawmakers in Congress from both parties were working together on plans that would expand background checks to all gun purchases and criminalize `` straw purchases '' in which legal gun owners buy weapons for people prohibited from doing so . Obama says no law can stop all gun violence , but the nation must try . Congress : Obama continues to call for only a ban on some weapons . A Republican leader asks if a weapons ban should be part of a legislative package . The debate on gun control is revived after the Connecticut school massacre .
NEW : Obama says no law can stop all gun violence , but the nation must try . Congress : Obama continues to call for only a ban on some weapons . A Republican leader asks if a weapons ban should be part of a legislative package . The debate on gun control is revived after the Connecticut school massacre .