US ambassador to the UN

Kelly Knight Craft, hosting an event in Ottawa, June 26, 2019, as US ambassador to Canada. On July 31, she was confirmed by the US Senate to be the next US ambassador to the UN, moving on to New York.
The Senate has confirmed Kelly Knight Craft to be Washington’s top ambassador to the United Nations, even as a key Democrat pronounced her “unfit to serve.” The move ends a seven-month vacancy in one of the country’s most senior diplomatic posts.

Marillyn Hewson, head of Lockheed Martin.
Marillyn Hewson, the head of Lockheed Martin Corporation, is the latest name to surface as a potential successor to Nikki Haley, the United States ambassador to the United Nations, according to a diplomat there.

Heather Nauert, the spokesperson for the US State Department, talking with reporters airborne to Singapore, Aug. 3, 2018. Trump has said she is his top choice to succeed Nikki Haley as US ambassador to the UN.
President Trump has apparently offered Heather Nauert the United States ambassadorship to the United Nations, according to numerous media reports. She would succeed Nikki Haley, who announced her resignation in early October, saying she wanted to work in the private sector. Trump said this week that he would announce Nauert’s nomination soon.