Educate-Yourself.org:The Freedom of Knowledge; The Power of Thought, Franklin Roosevelt knew of the Pearl Harbor at least attack 6 weeks before it happened. I had first hand telephone conversations with retired Navy officer Duane Whitlock before he passed away in which he told me that he was part of the Navy decoding team that deciphered the Japanese code in the late 1930s. He was part of the group that intercepted the Japanese transmissions that indicated their battle group was going to attack Pearl Harbor and he was present when this information was relayed to.