Nikki Haley, a Republican who ran against President-elect Trump months ago, responded after he publicly announced that she would not be joining his administration.
Responding in an equally public format, Haley wrote that she wishes him "great success."
"I was proud to work with President Trump defending America at the United Nations," she wrote in a X post Saturday.
"I wish him, and all who serve, great success in moving us forward to a stronger, safer America over the next four years," she said.