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Secretary of State Rex Tillerson waves goodbye after speaking at a news conference at the State Department in Washington, Tuesday, March 13, 2018. Trump fired Secretary of State Rex Tillerson on Tuesday and said he would nominate CIA Director Mike Pompeo to replace him, in a major staff reshuffle just as Trump dives into high-stakes talks with North Korea. (AP Photo/Andrew Harnik)
Secretary of State Rex Tillerson waves goodbye after speaking at a news conference at the State Department in Washington, Tuesday, March 13, 2018. Trump fired Secretary of State Rex Tillerson on Tuesday and said he would nominate CIA Director Mike Pompeo to replace him, in a major staff reshuffle just as Trump dives into high-stakes talks with North Korea. (AP Photo/Andrew Harnik)

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'Rexit' raises concern abroad on stability of US govt

CNN's Jeff Zeleny reports.