Behind closed doors in 2017, President Donald Trump discussed the idea of using a nuclear weapon against North Korea and suggested he could blame a U.S. strike against the communist regime on another country, according to a new section of a book that details key events of his administration.

Trump’s alleged comments, reported for the first time in a new afterword to a book by New York Times Washington correspondent Michael Schmidt, came as tensions between the U.S. and North Korea’s Kim Jong-un escalated, alarming then-White House chief of staff John Kelly.

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