Heather 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 Ms Haley, who is a former governor of SC.
Sources are indicating US President Donald Trump has made the previously-hinted-at decision to replace retiring United Nations ambassador Nikki Haley with foreign-policy newcomer Heather Nauert.
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 and the State Department did not immediately respond to requests for comment. She had no government or foreign policy experience prior to joining the Trump Administration.
Nauert would take up the US mantle at the United Nations including holding sanctions on North Korea and defending Israel.
Trump is expected to tweet out announcement naming Nauert as next United Nations ambassador.
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.
If her appointment is confirmed she will replace Ms Haley, who had held the role since November 2016.
"She is clearly not qualified for this job, but these days it seems that the most important qualification is that you show up on Donald Trump's TV screen, and if you're successful in that endeavor, then you seem to be a top candidate to get a whole bunch of top positions in the US government".
A former news reporter for ABC, she joined Fox in 1996, originally as a correspondent and later as a co-host for Fox and Friends. Haley also didn't have foreign policy experience when she took the United Nations posting, but she had twice been elected governor of SC.
White House press secretary Sarah Huckabee Sanders described Nauert in March as "a team player" and "a strong asset for the administration". "What we've really discovered over the last two years is that even when you have a relatively mainstream, relatively collegial, relatively influential ambassador to the United Nations like Haley, that only buys you a limited degree of protection from a president like Trump".