Documentary brings together 20 presidential chiefs

Associated Press
Documentary brings together 20 presidential chiefs

In this photo provided by CBS Entertainment, Chicago Mayor Rahm Emanuel, left, laughs with late-night talk show host David Letterman during taping for the "Late Show with David Letterman," Monday, Sept. 9, 2013, in New York. Emanuel is to discuss the upcoming documentary, "The President's Gatekeepers," a two-part Discovery Channel special featuring Emanuel, who was formerly President Barack Obama's chief of staff. The "Late Show" airs Monday night on CBS television. (AP Photo/Jeffrey R. Staab, CBS Entertainment)

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