Documentary filmmaker Errol Morris talks about his new film about Donald Rumsfeld, “The Unknown Known,” Morris has said of the film: “To say that I came into this movie without strong ideas about Rumsfeld and his policies would be fraudulent and disingenuous, at best. I was very much against the Iraq war, and I still am—I think it was a terrible mistake. But I believe I made this film in the spirit of inquiry, with a genuine desire to investigate, a desire to find out something that I might not have known before.” "The Known Unknown" opens April 2 at Angelika Film Center and at Lincoln Plaza Cinemas.