U.S.-Japan Caucus visited Japan for five days as an official representative of the United States and the U.S.-Japan Caucus. While there, he met with various officials within the Japanese Government, including, Shinzo Abe (The Prime Minister of Japan), Caroline Kennedy (the then-U.S. Ambassador to Japan), Yoichi Miyazawa (Then Japanese Miniser of Economy, Trade, and Industry), as well as the members of the Japanese-US Parliamentary Friendship League (the Japanese counterpart of the U.S.-Japan Caucus). On January 12, 2016, the U.S.-Japan Caucus came out in support of a historic agreement between Japan and South Korea surrounding the controversial issue of Japanese Comfort Women. The
Kozo Yamamoto appointed his ministerships in 2016. Yamamoto is a known advocate of reflation policies, and is one of the first to argue for using monetary easing tools to overcome deflation in Japan. As a longtime critic of the Bank of Japan's monetary tightening policies in the Diet, he chaired multiple study groups on monetary policy when the LDP was out of power, and appealed to Shinzo Abe the need for quantitative easing. Yamamoto proposed the consumption tax increase of April 2014 to Abe Shinzo, and advised swift action. He also advocated for basic allowances and various public-works projects for low-income earners