Donald Trump has cut short his attendance at the Nato summit in London and accused Justin Trudeau of being 'two-faced' after the Canadian leader was heard apparently mocking the president's predilection for long, impromptu press conferences at a Nato reception at Buckingham Palace. 'He was late because he takes a 40-minute press conference off the top,' Trudeau could be heard saying, as other world leaders laughed. Boris Johnson, one of those present, denied they had been joking about Trump