With a typically unconventional approach, Academy Award-winning director Errol Morris offers a thoroughly fascinating look at the life of Donald Rumsfeld, the Secretary of Defense under George W. Bush who left a lasting legacy as the principal architect of the Iraq War. Comprised largely of extended interviews with Rumsfeld himself, “The Unknown Known” charts Rumsfeld’s long history in Washington, from his roles as ambassador under Nixon and Secretary of State under Ford to his return to politics during the Bush years, allowing Rumsfeld to explain his decisions and philosophies. The result is less a political commentary than it is an examination of the dual-edged power of language, which can be used as a tool for diplomacy or for evil.