David Petraeus, former director of the Central Intelligence Agency (CIA), arrives to speak during the Aspen Ideas Festival in Aspen, Colorado, U.S., on Monday, June 30, 2014. The festival gathers some of the foremost thinkers in the world with civically-minded leaders in business, the arts, politics, philanthropy to share ideas and questions and drive thought to action. Photographer: Matthew Staver/Bloomberg via Getty Images
