our counterterrorism, sbenls, homeland sturt and law enforcement communities are working 24/7 to protect our homeland and all of us can do our part by staying vigilant by saying something if we see something that is suspicious, by refusing or it terrorized and by staying united as one american family. in short, for all very real progress america's made over the past seven years, we still have some unfinished business. and i plan on doing everything i can with every minute of every day that i have left as of the american people. since taking this office, i've never been more optimistic about a year ahead than i am right now. and in 2016, i'm going to leave it out all on the field. with that, let me take some questions, i'll start with reuters. >> mr. president, you're going to california today, and as you said earlier this week, you told the nation that there's no specific or credible threat of a similar attack, but how is it really possible to know -- i mean, aren't similar plots going to be just as hard to detect beforehand? and some lawmakers are saying that your government should revi