How escalator safety mechanisms work — and why they cause machines to stop

President Trump called his escalator mishap at the United Nations "sabotage." The U.N. says the White House team triggered a ...
The Public's Radio

Trump is accusing the U.N. of ‘sabotage.’ The U.N. says Trump’s team is to blame

Trump says three "sinister events" disrupted his speech: a frozen escalator, a broken teleprompter and a too-quiet sound ...