SINGAPORE – President Donald Trump said Canadian Prime Minister Justin Trudeau "learned" from the mistake of criticizing him, and it's going to cost Canada "a lot of money."

At a news conference Tuesday after his summit with North Korean leader Kim Jong Un, Trump recounted his recent tough exchanges with Trudeau. He said the Canadian leader must not have realized that Trump had televisions on Air Force One, allowing him to monitor Trudeau's news conference at the end of the G-7 summit.

"He learned. That's going to cost a lot of money for the people of Canada. He learned," Trump said wagging his finger. "You can't do that. You can't do that."

The president said he was annoyed by Trudeau's comments about not letting Canada get pushed around.

"I see the television that he's giving a news conference about how he will not be pushed around by the United States. And I say, push him around? We just shook hands. It was very friendly," Trump said.

Trump said he had a "good relationship with Justin. I really did."

But Trump called Trudeau "dishonest" and "weak" in tweets following the summit on Saturday. Trump advisers also took up the attack in appearances on Sunday's news shows, levelling more withering and unprecedented criticism against Trudeau, branding him a back-stabber unworthy of Trump's time. "There's a special place in hell for any foreign leader that engages in bad faith diplomacy with President Donald J. Trump and then tries to stab him in the back on the way out the door," Trump trade adviser Peter Navarro said on "Fox News Sunday."

When asked about Trump's remarks in Parliament on Tuesday, Trudeau said he supports Trump's efforts on North Korea and looks forward to the details of that agreement.

"On his comments I'm going to stay focused on defending jobs for Canadians and supporting Canadian industries," Trudeau said before walking away from reporters.

The president also commented at the news conference on the viral photo taken of German Chancellor Angela Merkel and others standing before him. Trump said it was snapped as they waited for changes he'd requested to the communique he ended up pulling out of.

Trump said it "didn't look friendly" but it was "very friendly."

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Gillies reported from Toronto.