CIA contractors who responded to terror attack in Libya will tell their story to Congress . Lawmakers have been pressing for public accounts from the September 2012 attack . Congressman Ted Stevens and three other Americans were killed in attack . Benghazi has become a political battle between Republicans and Obama Democrats .
CIA contractors who responded to terror attack in Libya will tell their story to Congress . Lawmakers have been pressing for witness accounts from the September 2012 attack . Ambassador Christopher Stevens and three other Americans were killed in attack . Benghazi has become a political flashpoint between Republicans and Obama administration .