State Department spokeswoman Heather Nauert is set to be the next U.S. ambassador to the United Nations, according to USA media reports.
Nuart was brought on to the administration after providing commentary on "Fox and Friends" on what appears to be Trump's favorite cable news network.
She would replace Nikki Haley, who announced that she was resigning in October. A Republican congressional aide said the president was expected to announce his decision by tweet on Friday morning.
However Ms Haley has made no secret of the fact that she has had policy disagreements with Mr Trump.
Two administration officials confirmed Trump's plans.
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.
Requests for comment to the state department and the White House were not immediately returned.
Nauert, who did not have a good relationship with Tillerson and had considered leaving the department, told associates at the time she was taken aback by the promotion offer and recommended a colleague for the job.
That role gave her responsibilities far beyond the news conferences she held in the State Department briefing room.
The post is considered one of the highest profile positions in US diplomacy.
One of the reports came from Fox News, where Ms Nauert has previously worked as a presenter. She does not have prior political or policy-making experience.
"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".