First several years of WWII

As a U.S. Navy intelligence officer stationed in the Philippines during the fall of 1941, you have been asked to draft a written brief on the motives and actions of the Japanese Empire to the House Committee on Foreign Relations in response to rumors that Japan might be making war plans against the United States.
What facts or evidence can you provide the committee on the agenda of the Japanese over the last 3 years (1939-1941)? What evidence or arguments can you provide that may convince the committee that Japan is an aggressive and imperialistic nation that may attack U.S. assets in East Asia?
Your journal entry must be at least 200 words in length. No references or citations are necessary.