Nauert, who has shown poise in front of the cameras and mostly avoided gaffes, would succeed Nikki Haley, a former SC governor seen as entertaining ambitions for higher political office.
On a day of other staff shakeups, the president also said he'll have an announcement of a major change in his top military brass on Saturday when he attends the annual Army-Navy football game in Philadelphia. "She's very talented, very smart, very quick". He said he thought she would be "respected by all". Haley had lobbied hard to get the resolution passed, but couldn't garner the two-thirds majority needed.
The former Fox News host's precipitous rise since arriving at the State Department in 2017 sets the stage for a potentially tough Senate confirmation hearing, where Democrats will likely grill Nauert on her qualifications for the position.
"Those I know who work with her remark frequently that she is more open than most Trump appointees to listening to and working with career diplomats", said Brett Bruen, who served as White House director of global engagement under former president Barack Obama.
Though Nauert reportedly had a shaky relationship with her old boss, former Secretary of State Rex Tillerson, she received an all-systems-go for the United Nations position from current Secretary Mike Pompeo.
Nauert covered domestic and worldwide stories as an ABC News correspondent from 2005 to 2007 prior to joining Fox.
The contrast between Haley and Nauert's respective credentials and diplomatic experience couldn't be more stark. She does not have prior political or policy-making experience.
But she has taken on a bolder role under Pompeo, assertively seeking to promote his message. Nauert has served as a spokesperson for the State Department since April 2017. She never traveled with and was not close to her first boss at the department, former Secretary of State Rex Tillerson.
The U.N. has had several female ambassadors from the U.S. The post is not always a Cabinet-level position.
"I don't think Haley is thinking about running in 2020". She will learn the brief. "I'm not sure anyone would advise him that the way to solve all his problems is to put a "Fox & Friends" anchor as our top ambassador to the United Nations".
Nauert won't face an easy confirmation given her lack of experience and the likelihood that she'll be asked to answer for the Trump administration's scorn for worldwide bodies, including the UN.
"Heather Nauert is not going to be a big-time player in the deliberations on substance in the administration", he said. And the pick for the high-profile USA policy megaphone, seems more than justified, at least at first glance.
U.S. State Department spokeswoman Heather Nauert will be nominated ambassador to the UN, Bloomberg reports.
But Trump has also used the United Nations to try to advance his foreign policy agenda on Iran and North Korea.