Washington (CNN) North Korea should give a full accounting of the circumstances surrounding Otto Warmbier's death, President Donald Trump's national security adviser John Bolton said Sunday.

"The best thing North Korea could do right now would be to give us a full accounting of what happened and who was responsible for it," Bolton said to CNN's Jake Tapper on "State of the Union."

Bolton was also asked if he takes North Korean leader Kim Jong Un at his word that he didn't know of Warmbier's suspected torture.

"The President takes him (Kim) at his word," Bolton told Tapper.

Pushed again, Bolton replied, "My opinion doesn't matter."

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