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Stephane Dujarric, the U.N. spokesman, said a videographer from the U.S. delegation who ran ahead of him triggered the stop mechanism at the top of the escalator.
As he began his speech, Trump also noted that the teleprompter wasn't working. He joked that whoever was running the teleprompter "is in big trouble."
A U.N. official speaking on condition of anonymity because of the sensitivity of the issue contributed that one to his side as well, saying the White House was operating the teleprompter for the president.