Mike Waltz was confirmed on Friday as the new US ambassador to the UN Security Council by the Senate in a 47-43 vote.
A separate vote was not held to formally designate Mr Waltz as a representative at the UN General Assembly, due to objections from Democrats, AP reported, quoting a person familiar with the Senate deliberations.
It is unclear how or whether Mr Waltz will be able to participate at the annual gathering in New York next week, when world leaders will gather in New York to lay out their countries' priorities on world peace and development.
During his confirmation hearing before the Senate Foreign Relations Committee in July, Mr Waltz criticised the global body for what he called a bloated bureaucracy, anti-American bias, and a record of inefficiencies in conflict prevention. He vowed to “make the UN great again”.
Mr Waltz previously served as head of the National Security Council but he was removed from the position and nominated for UN envoy after he inadvertently added a journalist to a private government chat focused on US strikes on Yemen earlier this year.
The former Florida congressman was a colonel in the National Guard and is a long-time Trump loyalist who supported the President's claims that the 2020 election was rigged.
He is a China hawk and has been a vocal critic of the chaotic US withdrawal from Afghanistan. He was the first Green Beret to be elected to Congress, after several combat tours in Afghanistan, the Middle East and Africa, according to his biography.
This year, Palestine is expected to be a major topic at the UN General Assembly. A summit hosted by France and Saudi Arabia will focus on a two-state solution to the Palestinian-Israeli conflict. A number of countries are also expected to recognise Palestine during this year's UNGA.
