In February 1904, he visited the US and had diplomatic talks with President Theodore Roosevelt (who had been contemporarily at Harvard University) about the Russo-Japanese War (and returned to Japan in October of the following year).
1904年（明治37年）2月、渡米し、日露戦争についてセオドア・ルーズベルト大統領（ハーバード大学時代の学友）と交渉（翌年10月帰国）。