"He's two-faced," he told reporters on the sidelines of the NATO summit, saying he had called out Trudeau on defence spending "and he's not very happy about it".

Trump also announced Wednesday that he might cancel a planned final news conference scheduled for after the NATO summit, after two days of sharp disputes with allies.

"We'll go directly back," he told reporters ahead of a one-to-one meeting with German Chancellor Angela Merkel. "Ï think we've done plenty of press conferences."

Earlier on Tuesday, the leaders of Britain, Canada, France and the Netherlands have  been caught on camera at a Buckingham Palace reception mocking US President Donald Trump's lengthy media appearances ahead of Wedensday's NATO summit.

The footage, shot by the British host's camera pool on Tuesday evening and spotted and subtitled by Canada's CBC, set the tone for the allies' summit in Watford, just outside London.

British Prime Minister Boris Johnson can be heard asking France's President Emmanuel Macron: "Is that why you were late?"

Canada's Prime Minister Justin Trudeau interjects: "He was late because he takes a 40 minute press conference off the top."

Earlier Tuesday, Macron's one-on-one pre-summit meeting with Trump had been proceeded by a lengthy question and answer session with the media, as the leaders publicly disagreed about NATO strategy and trade.

In the video, Macron appears to tell an anecdote about the encounter as Britain's Princess Anne and Dutch Prime Minister Mark Rutte look on, but the French leader's back is to camera and he is inaudible amid the hubbub.

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