President Donald Trump appeared to laugh it off Tuesday when an escalator and a teleprompter both malfunctioned during his United Nations visit -- but for US officials it was no laughing matter.

The White House said an investigation had been launched into whether the moving stairway was stopped on purpose to humiliate the US president, who later bashed the global body in his speech to the UN General Assembly in New York.

"If we find that these were UN and staffers who were purposefully trying to trip up, literally, trip up the President and the First Lady of the United States, well, there better be accountability for those people, and I will personally see to it," Press Secretary Karoline Leavitt said on Fox News Tuesday evening.

A UN spokesman said the mishap happened because someone i

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