Trump had already confirmed that Nauert was a "very serious consideration" in early November.
State Department spokeswoman Heather Nauert is set to be the next U.S. ambassador to the United Nations, according to USA media reports.
Nauert joined the administration in 2017 after several years as an anchor on Fox News, and has quickly moved up the ranks, joining Secretary of State Mike Pompeo's inner circle, according to Bloomberg.
She would be taking the position amid a roster of thorny global challenges, ranging from North Korea's nuclear program to Yemen's starvation and the growing divide between the USA and its closest allies over the Iran nuclear deal, climate change and other issues.
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.
She will take over from Nikki Haley who announced her resignation in October.
Nauert and the State Department did not immediately respond to requests for comment.
That means Nauert would wield less clout than her predecessor, both at the United Nations and within the administration, and as a result, would pose nowhere near the challenge to national security adviser John Bolton, White House chief of staff John Kelly or Pompeo.
Haley similarly had little foreign policy experience when appointed, although she had a national name as the governor of SC.
It is not yet clear who would take over her role as State Department Spokesperson.
Nauert joined the State Department past year after a career as a television anchor and correspondent at Fox News. Trump is a regular viewer and one time guest of the show, and Nauert herself has developed a close relationship with Trump's daughter Ivanka.
The president picked Nauert after considering other potential nominees including former White House aide Dina Powell, ambassador to Canada Kelly Craft and ambassador to Germany Ric Grenell. She met with Trump at the end of October, fueling speculation that she had emerged as the president's top choice for the role.
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