Is Donald Rumsfeld, the charismatically cantankerous and contrarian former Secretary of Defense who, under President George W. Bush, presided over disastrous Iraq War policy and the torture of enemy combatants and other foreign prisoners, a dyed-in-the-wool military adventurist or a cog-in-the-machine bureaucrat and incidental prosecutor? Documentarian Errol Morris spent more than 34 hours interviewing him for his superb new film, The Unknown Known, and he still isn’t sure. I recently had a chance to chat with the Oscar-winning filmmaker and, wearing a light green sweater and a wry smile, Morris spoke deliberately, as is his wont, about his movie, its elusive subject, the art of interviewing and his first foray into fictional narrative filmmaking, set to star Bryan Cranston and Naomi Watts. The conversation is excerpted over at Paste, so click here for the read.