I ask that the Congress declare that since the unprovoked and dastardly attack by Japan on Sunday, December 7, 1941, a state of war has existed between the United States and the Japanese Empire. Which key idea does Roosevelt refine in this sentence?

He is calling on Congress to investigate Japanese acts of aggression to determine if they are serious enough to go to war.

Roosevelt wants Congress to grant him the power to declare war himself, rather than wait for their approval.

He is establishing that the long-term conflict that has existed between the United States and Japan could be ended by war.

He is again emphasizing Japan's deception and unprovoked attacks as reasons for the United States go war with Japan.