On December 13, 2022, Hiroshima Mayor Matsui, President of Mayors for Peace, and Nagasaki Mayor Taue, Vice President of Mayors for Peace, visited the Prime Minister's Office and presented a letter of request and the Hiroshima Appeal to Prime Minister Fumio Kishida. The letter of request was adopted at the 10^th Japanese Member Cities Meeting of Mayors for Peace and the Hiroshima Appeal was adopted at the 10th General Conference of Mayors for Peace, and called on the Japanese government to promote efforts toward nuclear abolition.
　In response, Prime Minister Kishida said, "The Treaty on Prohibition of Nuclear Weapons (TPNW) is an important treaty that serves as a towards achieving the goal of a nuclear-weapon-free world, and I believe the major point is how to bring the nuclear weapon states closer to this goal. We understand that many people are calling for the Japanese government to participate as an observer in the TPNW Conference of the Parties and to sign and ratify the TPNW. However, we would like to first build trust with the United States as we consider how to address this issue."