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.
According to her State Department biography, she worked at ABC News prior to her time at Fox, and before that spent a term as a member of the Council on Foreign Relations.
Nauert, who earlier this year had been considered a possible successor to White House spokeswoman Sarah Sanders, gained experience on diplomacy by working at the State Department, but she lacks the political and policy credentials of Haley, a former SC governor.
Nauert was formerly a co-host on morning cable news show "Fox & Friends" as well as a correspondent for CBS News.
The current State Department spokeswoman has earned the trust of Secretary of State Mike Pompeo, and Trump's daughter Ivanka Trump and her husband Jared Kushner, Bloomberg reported. Nauert would need to be confirmed by the Senate before taking up the role.
Global CO2 pollution set to make sharp rise this year
The Paris accord set a goal of limiting the rise in global temperatures to less than two degrees Celsius by 2030. The 28 European Union nations will collectively record a decline in emissions by 0.7% as compared to past year .
Police 'Tie Pieces Of The Puzzle Together' In Lyn Dawson Murder
Police will use previous interviews they had conducted with Mr Dawson since his wife's disappearance as evidence in the case. The husband of Sydney mother Lynette Dawson , who disappeared nearly 40 years ago, has been charged with her murder.
Mattis: Putin tried to 'muck around' in US midterm elections
Russian Federation continues to violate global agreements to which the United States cannot trust the leadership of this country. Trump had scrapped a more formal meeting with Putin, citing Russia's treatment of Ukraine.
Two administration officials confirmed Trump's plans.
Still, with Trump, no staffing decision is final until he makes the formal announcement, since he has been known to change course in the past.
He pulled the United States out of the U.N. human rights body in September, citing bias toward Israel, and his administration has cut funding for the U.N. refugee agency and past year proposed US funding cuts for aid and diplomacy that could curb the work of the global body.
A key question with Nauert will be whether the president keeps the United Nations envoy job as a Cabinet-level position, or downgrades it to report through Pompeo, as other administrations have sometimes done.
The president considered Nauert for the position among a list of potential nominees that included former White House aide Dina Powell and ambassador to Germany Richard Grenell.