← Chronicle · Confirmation · September 19, 2025

Mike Waltz Confirmed as Ambassador to the United Nations, 47–43

Senate vote: 47–43

Mike Waltz was confirmed by the Senate as United States Ambassador to the United Nations on September 19, 2025, by a vote of 47–43, and was sworn in on September 20, 2025.

His path to the seat ran through the administration’s first major personnel upheaval: Waltz served as National Security Advisor from January to May 2025 and was removed after the Signal group-chat episode; President Trump nominated him for the UN post on May 1, 2025, with Secretary of State Marco Rubio serving as National Security Advisor in the interim. The UN seat had its own churn — Elise Stefanik was the original nominee and withdrew, and Dorothy Shea served as acting ambassador in the gap.

The mission that started here is the UN portfolio this chronicle tracks: Waltz is the administration’s voice in the Security Council and the General Assembly, the post from which he was seated at the President’s side for the Gulf Cooperation Council meeting of September 22, 2026, paged in this site’s video collection.

Sources: Senate confirmation record, September 19, 2025, 47–43, and the September 20, 2025 swearing-in (banked in this site’s Mike Waltz profile research, cluster C); United States Mission to the United Nations.