Trudeau was filmed at a Buckingham Palace reception for NATO leaders on Tuesday evening describing how surprised US officials appeared to be by Trump’s performance at an earlier news conference.
The conversation, which involved Trudeau, British Prime Minister Boris Johnson, French President Emmanuel Macron and Dutch Prime Minister Mark Rutte, was recorded on video and snippets were audible.
“Is that why you were late?” Johnson asked Macron.
“...It was like a 40-minute press conference,” Trudeau said. “Yeah, yeah, yeah! Forty minutes.”
Other words were exchanged but could not be heard, before Trudeau added: “I just watched his team’s jaws drop to the floor.”
Trump wasn’t mentioned by name during the exchange.
Footage of the palace reception was recorded by a pool camera. The clip was posted online by Canadian broadcaster CBC and has been viewed more than 5 million times.
Asked on Wednesday if he had heard Trudeau’s remarks about him, Trump said: “He’s two-faced”. He suggested that Trudeau was upset because he had challenged him for failing to meet the NATO target of spending 2% of its gross domestic product on defense.
“I find him to be a very nice guy but you know the truth is that I called him out over the fact that he’s not paying 2% and I can see he’s not very happy about it,” Trump said at a news conference alongside German Chancellor Angela Merkel.
“He’s not paying 2% and he should be paying 2%,” Trump added. “Canada – they have money. Look, I’m representing the US and he should be paying more than he’s paying, he understands it ... I can imagine he’s not that happy but that’s the way it is.”
Trudeau spoke briefly to Trump as NATO leaders gathered for a summit Wednesday in Watford, outside London, and the two men shook hands.
Leaders of the 29 NATO states are marking the 70th anniversary of the military alliance — and trying to patch up differences over defense spending, the alliance’s strategic direction and member nation Turkey’s military action in northern Syria.
Reuters and AP contributed to this story.