If Ms Nauert is confirmed by the Senate, she would be a leading administration voice on Trump's foreign policy. He praised her, saying she was "very talented, very smart, very quick and I think she will be respected by all". Former President Barack Obama's United Nations ambassadors, Susan Rice and Samantha Power, had the designation, as did Haley, who came to the role after being South Carolina's governor.
Nauert has also taken criticism over her years of experience as a Fox News anchor, which some argue are a poor substitute for diplomatic experience.
At the time, Trump, alongside Haley, said in a meeting with reporters,"She's done a fantastic job, and we've done a fantastic job together". She has been chief spokeswoman for the State Department since April a year ago, having been poached from Fox.
Ms Nauert worked for Fox News from 1998 to 2005 and, after two years away during which she worked for ABC, she returned to Fox in 2007, later becoming a presenter for Fox & Friends.
The State Department used to hold daily briefings.
She told associates in November that she was shocked to be chosen as United Nations ambassador, and recommended a colleague for the job instead. The president both denies watching hours of Fox and other networks each day and says publicly that he "watches all the shows".
Nauert, who became State Department spokeswoman under former secretary Rex Tillerson, did not respond to requests for comment.
"But I don't agree with the president on everything".
However, Haley admitted she and the president "agree on most things", but "there are certainly things that we don't agree on". "The more bureaucrats we have, the better the job gets done".
President Donald Trump says he'll nominate State Department spokeswoman Heather Nauert (NOW'-urt) to be the next US ambassador to the United Nations. "We need a seasoned, steady and strong voice who understands the subtleties of multinational diplomacy", he said.
"She is obviously extremely knowledgeable and well-versed in the foreign policy of this administration and has answered questions and defended it in front of a number of different press inquiries", Schaefer said.
Schaefer notes, though, that Trump already has a team in place that he relies on for help in crafting foreign policy -Pompeo and National Security Adviser John Bolton. "Ambassador Haley was a far more high-level figure, particularly early in the administration".
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