State Department spokeswoman Heather Nauert is set to be the next U.S. ambassador to the United Nations, according to USA media reports.
Nauert's nomination had been rumoured for weeks, and she had started handing over some of her responsibilities as spokeswoman to her deputy, Robert Palladino.
She was a reporter for Fox News Channel before she became State Department spokeswoman under former secretary Rex Tillerson.
Nauert joined the State Department a year ago after a career as a television anchor and correspondent at Fox News. Nauert, 48, worked as a Fox News host prior to her role in the State Department.
She will face a variety of challenges if confirmed for the job, including championing USA efforts to contain Iran's influence in the Middle East and ensuring the global body maintains tough sanctions on North Korea as Washington tries to negotiate an end to Pyongyang's nuclear and missile programs.
Nikki Haley has been a very popular figure among conservatives for her tough attitude against anti-American attitudes at the United Nations.
The announcement would come hours after a resolution championed by Haley condemning the Hamas terror group failed to pass in the General Assembly. She announced in October that she would leave the position by the end of the year.
But Trump has also used the United Nations to try to advance his foreign policy agenda on Iran and North Korea.
Ahead of the vote, the USA ambassador sent a letter to all UN missions to make clear that "the United States takes the outcome of this vote very seriously". At the time, she described her time in the position as a "blessing", but offered no reason for leaving except a belief that government officials must know "when it's time to step aside".
Resolutions adopted by the General Assembly are non-binding, but they carry political weight and are seen as a barometer of world opinion.
Bloomberg also reported Thursday that President Trump had chosen Nauert for the role.
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