"The president has to project to the American people a sense of demanding idealism. Idealism which is not based in self-indulgence, but on self-denial and sacrifice, and on this such an America is going to be credible to the world."

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We do want people to know if in fact we learn of an incident that's focused on a particular city.If we learn of long-term planning, that's focused on a particular industry or infrastructure. And so we feel we have an obligation to let people know if we have information of a credible threat or not.

— Barack Obama