In October, Haley announced that she was leaving the post by the end of the year. The 46-year-old former South Carolina governor has served nearly two years in the post. She is the first Indian-American ever appointed to a Cabinet position in any US presidential administration.
Nauert, 48, is an unorthodox choice, given her little experience in government or foreign policy before she took up the role at the state department.
She was made the state department spokeswoman in April 2017, her first government position. This year, after former Secretary of State Rex W Tillerson was fired, she was named the acting undersecretary for public diplomacy and public affairs.
She eventually became an anchor on "Fox & Friends", the president's favourite show.
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