President Trump accused the United Nations of "sabotage" and demanded an investigation Wednesday after an escalator and teleprompter malfunctioned during his visit to U.N. headquarters — though the U.N. says a videographer from Mr. Trump's delegation may have triggered the escalator's safety shutoff.

Shortly after Mr. Trump and first lady Melania Trump entered U.N. headquarters in New York City on Tuesday to address world leaders at this year's General Assembly session, they stepped onto an escalator. But the machine ground to a halt almost immediately, forcing both Trumps to start climbing the stairs on their own, videos of his arrival show.

Later, as Mr. Trump began his speech to the General Assembly, he remarked that his teleprompter wasn't working. "I can only say that whoever's

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