Nauert, who will be replacing Nikki Haley, is currently the State Department spokeswoman
Mr. Trump is expected to make the announcement Friday morning.
Nauert has been on the short list for ambassador to the U.N. 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. She will have to be confirmed by the Senate to become ambassador to the U.N