White House Chief Denis McDonough for "The Presidents' Gatekeepers" [Getty Images]

WASHINGTON, DC -- MAY 13: Obama White House Chief of Staff Denis McDonough interviewed for 'The Presidents' Gatekeepers' documentary in the Old Executive Office Building, May 13, 2013 in Washington, DC. (Photo by David Hume Kennerly/Getty Images)

Archive Photos David Hume Kennerly