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Donald Trump called Justin Trudeau "two-faced" after a hot-mic video captured the Canadian prime minister joking about the U.S. president's extended remarks to reporters at a NATO summit this week.

"He's two-faced," Trump told reporters at a meeting with German Chancellor Angela Merkel on Wednesday. "I find him to be a very nice guy, but the truth is I called him out on the fact that he's not paying 2% and I guess he's not happy about it."

A TV camera caught Trudeau apparently joking about Trump with France's Emmanuel Macron and the U.K.'s Boris Johnson at a reception on Tuesday. The U.S. president wasn't present.

Johnson asked Macron why he had arrived late to the reception, and Trudeau interjected, saying, "He was late because he takes a 40-minute press conference off the top."

The remark was an apparent reference to Trump's penchant for holding impromptu news conferences at the beginning of his meetings with other leaders. Trump spoke to reporters for more than two hours combined on Tuesday before meetings with NATO General Secretary Jens Stoltenberg, Macron and Trudeau.

"You just watched his team's jaws drop to the floor," Trudeau added.

In his meeting with Trudeau, Trump questioned the Canadian prime minister about how much his country spends on its own defense. Canada does not meet NATO's target for member countries to spend 2% of their gross domestic product on their militaries.

"What are you at? What is your number?" Trump asked.

Trudeau tried to evade answering directly, saying: "The number we talk about is a 70% increase over these past years. We are increasing significantly our defense spending from previous governments that cut it."

But Trump followed up. "Okay, where are you now, in terms of your number?"

After some discussion with an aide, Trudeau answered: "1.4."

"They'll get there. They're getting there," Trump said.

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