State Department spokeswoman Heather Nauert is set to be the next U.S. ambassador to the United Nations, according to USA media reports.
Nauert, whose nomination would require Senate confirmation, is a former Fox News Channel correspondent and anchor.
Nikki Haley abruptly resigned in October calling her time as United Nations ambassador the "honor of a lifetime".
When she announced her decision to step down the president called her a "very special person" and said she had told him some months before that she wanted to take some time off. Officials at the White House at times viewed Haley with skepticism, in part over her willingness to publicly disagree with the president.
Three people familiar with President Trump's decision to name Nauert confirmed the pick, according to the report.
Trump had previously said Nauert was under serious consideration to replace Haley, though he's been known to change course on staffing in the past.
Requests for comment to the state department and the White House were not immediately returned.
ABC News reported in November that Nauert had been offered the United Nations job, but it was not clear at the time whether she had accepted.
Ms Nauert was made state department spokeswoman in April 2017, her first government position. With a master's degree from Columbia University's Graduate School of Journalism, she had come to Fox from ABC News, where she was a general assignment reporter.
Ahead of the vote, the U.S. ambassador sent a letter to all UN missions to make clear that "the United States takes the outcome of this vote very seriously".
Shut out from the top by Tillerson and his inner circle, Nauert developed relationships with career diplomats. She announced in October that she would leave the position by the end of the year.
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