NEW: Trump admin received information that Kim Jong Un had heart surgery last week and if he's alive, his health is poor, I'm told. KJU hasn't been seen at key events in recent days. It's unclear to US officials if he's dead or alive. (CNN 1st reported his condition's grave.)
Trump administration officials are looking into who would be in the line of succession if Kim Jong Un dies or is already dead, I'm told.
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