elisabeth bumiller covers the pentagon for "the new york times." joe kleine is a time magazine columnist. andrea mitchell is chief foreign affairs correspondent at nbc news. and david ignatius is a "washington post" columnist. first up, president obama reminded the country this week that enemies of america are still very much a threat. >> we are at war. we are at war against al qaeda. a far-reaching network of violence and hatred that attacked us on 9-11, that killed nearly 3,000 innocent people, and that is plotting to strike us again. chris: today we examine that threat with these four reporters who cover national security. we'll look at how al qaeda threatens us abroad as that new year's attack on our c.i.a. headquarters in afghanistan so tragically showe but first let's look at the threat of the next al qaeda attack here at home. david, if you're in charge of intelligence in this country and looking out at the world, what's the threat coming here? >> the threat is that this is a resourceful, adaptable enemy that learns from us. they study us. s