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March 9, 2011: Former Secretary of Defense Donald Rumsfeld discussed his bestselling memoir, ‘Known and Unknown’ from the East Room at the Richard Nixon Presidential Library with nationally syndicated radio talk show host Hugh Hewitt. Serving a total of four Presidents, Rumsfeld started his executive branch career under President Nixon, serving as Director of the Office of Economic Opportunity, Counsellor, and Ambassador to the North Atlantic Treaty Organization.