I guess progressive presidents are prone to do this:
FTA: With diplomatic negotiations with Japan breaking down, President Franklin D. Roosevelt and his advisers knew that an imminent Japanese attack was probable, but nothing had been done to increase security at the important naval base at Pearl Harbor. It was Sunday morning, and many military personnel had been given passes to attend religious services off base. At 7:02 a.m., two radar operators spotted large groups of aircraft in flight toward the island from the north, but, with a flight of B-17s expected from the United States at the time, they were told to sound no alarm. Thus, the Japanese air assault came as a devastating surprise to the naval base.
He knew and did nothing to increase security at Pearl Harbor.
FTA: President Roosevelt and Secretary of State Cordell Hull knew a Japanese attack was imminent. Having received intelligence reports of intercepted coded messages from Tokyo to the Japanese ambassador in the United States, the president anticipated Japanese reprisals for his government’s refusal to reverse economic sanctions and embargoes against Japan. The Roosevelt administration had remained firm in its demand that the Japanese first withdraw from China and French Indochina, which it had invaded in 1937 and July 1941, respectively, and renounce its alliance with fascist Germany and Italy.