Nikki Haley, the United States Ambassador to the United Nations looks on during a meeting with US President Donald Trump speaks in the Oval office of the White House October 9, 2018 in Washington, DC. - Nikki Haley resigned Tuesday as the US ambassador to the United Nations, in the latest departure from President Donald Trump's national security team. Kathryn Dunn Tenpas, who has been tracking turnover in the Trump administration for the Brookings Institution, observed that Haley is the only Trump Cabinet number “who left on her own volition.”

“She’s basically learned how to do the job and now she’s gone,” Tenpas added. Haley had been an important member of the Trump foreign policy team — a former South Carolina governor who could talk the language of diplomats while defending Trump’s blunt talk to his international critics.
Nikki Haley announces her resignation as the United States Ambassador to the United Nations, effective at the end of the year.