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By the time of her last high-profile appearance at the United Nations General Assembly in September, when she appeared alongside President Trump, she had earned a reputation among world leaders as a someone who would promote American foreign policy but also serve as a moderating voice in the room.

\"PHOTO:
Evan Vucci/AP, FILE
PHOTO: President Donald Trump talks to Nikki Haley, the U.S. Ambassador to the United Nations, at the United Nations General Assembly at U.N. headquarters, Sept. 24, 2018.
>

Haley has been the UN ambassador since January 2017. Prior to that, she served as the Governor of South Carolina – a role she became famous for when she called for the Confederate battle flag to be removed from the State House in the wake of the deadly shooting in a historic African American church in Charleston.

Long rumored as a potential presidential candidate, Haley shot down that speculation and said she planned to campaign for the president during his re-election effort. She echoed that pledge in her resignation letter, a missive which was dated Oct. 3, and which ABC News has obtained.

\"I will once again become a private citizen,\" Haley wrote of her life after her U.N. post tenure ends. \"I expect to continue to speak out from time to time on important public policy matters, but I will surely not be a candidate for any office in 2020. As a private citizen, I look forward to supporting your re-election as President and supporting the policies that will continue to move our great country toward even greater heights.\"

With Haley's resignation, she joins the list of Trump administration officials to leave after less than two years in office.

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