LONDON (Reuters) - U.S. President Donald Trump denounced Justin Trudeau as "two-faced" on Wednesday after the Canadian prime minister was caught on camera laughing over Trump's press appearances during a chat with other leaders at a Buckingham Palace reception.

The incident came at a reception on Tuesday evening, after Trump had criticized French President Emmanuel Macron and other leaders during long question-and-answer sessions with reporters on the eve of a NATO summit.

Macron, Trudeau, British Prime Minister Boris Johnson and Dutch Prime Minister Mark Rutte were filmed chatting at the reception, along with Queen Elizabeth's daughter Princess Anne.

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"Is that why you were late?" Johnson can be heard asking Macron.

"...It was like a 40-minute press conference," Trudeau said. "Yeah, yeah, yeah! Forty minutes."

U.S. President Donald Trump talks with Canada's Prime Minister Justin Trudeau during a North Atlantic Treaty Organization Plenary Session at the NATO summit in Watford, Britain, December 4, 2019. Reuters/Kevin Lamarque

Other words were exchanged but could not be heard, before Trudeau added with a chuckle: "I just watched his team's jaws drop to the floor."

When asked about Trudeau's comments on Wednesday, Trump replied: "He's two faced."