"Haley discussed her resignation with Trump last week when she visited him at the White House, these sources said. Her news shocked a number of senior foreign policy officials in the Trump administration," Axios' Jonathan Swan reports.
While Axios does not state her reasons for leaving, there have been rumors Haley wants to run against Trump for the 2020 Republican presidential nomination.
UPDATE: 10:23 AM ET –
Trump tweets "big announcement with my friend Ambassador Nikki Haley."
NBC News confirms, says Haley has told her staff she is resigning.
UPDATE II: 10:40 AM ET –
NBC News reports Haley will be leaving at the end of the year, and Trump has told reporters she is welcome to return at any time.
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