The Pentagon was scheduled on Friday to brief Elon Musk on the U.S. military’s plan for any war that might break out with China, two U.S. officials said on Thursday.

       Another official said the briefing would be China focused, without providing additional details. A fourth official confirmed Mr. Musk was to be at the Pentagon on Friday, but offered no details.

       Hours after news of the planned meeting was published by The New York Times, Pentagon officials and President Trump denied that the session would be about military plans involving China. “China will not even be mentioned or discussed,” Mr. Trump said in a late-night social media post.

       It was not clear if the briefing for Mr. Musk would go ahead as originally planned. But providing Mr. Musk access to some of the nation’s most closely guarded military secrets would be a dramatic expansion of his already extensive role as an adviser to Mr. Trump and leader of his effort to slash spending and purge the government of people and policies they oppose.

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       It would also bring into sharp relief the questions about Mr. Musk’s conflicts of interest as he ranges widely across the federal bureaucracy while continuing to run businesses that are major government contractors. In this case, Mr. Musk, the billionaire chief executive of both SpaceX and Tesla, is a leading supplier to the Pentagon and has extensive financial interests in China.

       Pentagon war plans, known in military jargon as O-plans or operational plans, are among the military’s most closely guarded secrets. If a foreign country were to learn how the United States planned to fight a war against them, it could reinforce its defenses and address its weaknesses, making the plans far less likely to succeed.

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