Following the nomination, Nauert will probably face a tough Senate confirmation hearing on her qualification.

Meanwhile, experts noticed that Haley's successor will work under a circumstance largely different from Haley's days, when there were then the "nearly invisible" Secretary of State Rex Tillerson and "a practically dysfunctional National Security Council."

Haley, 46, was confirmed as the U.S. ambassador to the UN days after Trump's inauguration in January 2017. She has been seen as one of Trump's most trusted advisers.

Her resignation announcement nearly two months ago came as a surprise to many high-level administration officials. "I don't have anything set on where I want to go," the former South Carolina governor told reporters then.

Haley will remain in the post till the end of this year.

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