Mr Tillerson has been in talks with China to enlist its help getting North Korea to back down.
But Mr Trump's recent Twitter messages appeared to undercut Mr Tillerson's efforts, prompting Senate Foreign Relations Committee chairman Bob Corker to complain that Mr Trump was publicly castrating the Secretary of State and hurting diplomatic talks.
"I checked. I'm fully intact," Mr Tillerson said when asked about Mr Corker's comments.
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