Trump is expected to make the announcement Friday morning, informed sources told CBS News.
Nauert has been on the short list for ambassador to the UN since Haley announced that she was stepping down from her post in October.
Formerly a Fox News anchor, she came to the administration in 2017 with no prior government experience.
She will have to be confirmed by the Senate to secure her position, where Democrats will likely grill Nauert on her qualifications for the position.
In her new role, Nauert would be responsible for maintaining international support for economic sanctions against North Korea and continuing the Trump administration's unflinching support for Israel in the face of mounting scrutiny at the UN, reports The Washington Post.
"She's hard-working, she's smart and she never gives up in advancing an agenda that works for the US," the official said.
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