Trump accepts Nikki Haley's resignation as U.S. ambassador to UN

File photo shows Nikki Haley(R) and U.S. Secretary of State Mike Pompeo at the UN headquarters in New York, July 20, 2018. U.S. President Donald Trump said on Tuesday he has accepted Nikki Haley's resignation as the country's ambassador to the United Nations. (Xinhua/Li Muzi)