Tonight will be the third time the president addresses the nation from the oval office. Elizabeth herne joining us live with more here and what we are expected to hear tonight. [no audio] we have gunshots. Elizabet h forcing Law Enforcement officials any Intelligence Community to wrestle with possibility of new, homegrown terror threats, threats that are prompting president obama to get a Rare Oval Office address. He will talk about the actions we have taken not just since 9 11 but since paris to keep the American People safe. Reporter the president huddled with his National Security advisers on saturday as the fbi is investigating computer and phone files to figure out if the two shooters reached out to isis we have hundreds of people running down the leads all over the world trying to understand the electronic record around these two killers. Reporter the fbi raided the home of henrique marcus, the man believed to have supplied syed farook with rifles used in the attack that killed 1