Canadian Prime Minister Justin Trudeau “stabbed us in the back” late Saturday after President Donald Trump left for Singapore during a post-Group of Seven (G-7) meeting press conference, claiming Canada wouldn’t be “pushed around” by Trump. National Economic Council (NEC) Director Larry Kudlow shared those comments Sunday on CNN’s “State of the Union.”

A mystified Kudlow said, “[Trudeau] was polarizing. He really kind of stabbed us in the back. He did a great disservice to the whole G-7. President Trump played that process in good faith. So I ask you: He gets up in the airplane and leaves, and then Trudeau starts blasting him at a domestic news conference? I am sorry, that’s a betrayal. That’s a double-cross.”

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Trump and Trudeau have been at odds over new U.S. tariffs on steel and aluminum imports from Canada. The annual G-7 gathering includes the leaders of the U.S., France, Germany, Italy, Japan and the United Kingdom as well as Canada and focuses on economic issues. The Quebec event was the sixth year since 1981 that the G-7 has met in Canada.

After Trump left for Singapore Tuesday to prepare for his historic summit with North Korean leader Kim Jong-un to discuss denuclearization, Trudeau ripped the president for refusing to sign the group’s communiqué and promised retaliatory tariffs.

“Canadians, we’re polite, we’re reasonable, but we also will not be pushed around,” Trudeau said during his press conference Saturday. “The president will continue to say what he says. I have made it clear to the president that [imposing retaliatory tariffs] is not something we relish doing, but it’s something that we absolutely will do.”

Trump reacted Saturday on Twitter, writing, “Based on Justin’s false statements at his news conference, and the fact that Canada is charging massive Tariffs to our U.S. farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market!”

Trump added, “PM Justin Trudeau of Canada acted so meek and mild during our @G-7 meetings only to give a news conference after I left saying that, “US Tariffs were kind of insulting” and he “will not be pushed around.” Very dishonest & weak. Our Tariffs are in response to his of 270% on dairy!”

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Kudlow defended Trump’s tweets Sunday as he lashed out at Trudeau for “double-crossing” the president behind his back, saying, “POTUS is not going to let a Canadian prime minister push him around. He is not going to permit any show of weakness on the trip to negotiate with North Korea, nor should he.”

He warned that Trudeau’s rebuke, days before Trump becomes the first U.S. president to meet with North Korea’s leader since the communist nation was formed in 1948, could have jeopardized the summit’s outcome had the president not retaliated.

“I mean, [Trudeau] can’t put Trump in a position of being weak going into the North Korean talks with Kim. He can’t do that,” Kudlow said. “And by the way, President Trump is not weak. He will be very strong, as he always is.”

“Kim must not see American weakness,” he continued. “This is a case where Trudeau — it was like, I don’t know, pouring collateral damage on the whole Korean trip. That was a part of Trudeau’s mistake. Trudeau made an error. He should take it back. He should pull back on his statements and wish President Trump well in the Korean negotiations.”

Related: Here Are the Experts’ Must-Do’s for Denuclearizing Korea

White House National Trade Council Director Peter Navarro reinforced Kudlow’s harsh words during an interview on “Fox News Sunday,” saying there is a “special place in hell” for Trudeau after he ripped Trump behind his back.

“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,” Navarro said. “And that’s what bad faith Justin Trudeau did with that stunt press conference. That’s what weak, dishonest Justin Trudeau did. And that comes right from Air Force One.”

“Trudeau stuck our president in the back. That will not stand.”

Navarro warned that Trudeau committed “one of the worst political miscalculations of a Canadian leader in modern Canadian history” through Saturday’s press conference.

“All Justin Trudeau had to do was take the win. President Trump did the courtesy to Justin Trudeau to travel up to Quebec for that summit. He had other things, bigger things on his plate in Singapore,” Navarro noted. “And what did Trudeau … do as soon as the plane took off from Canadian airspace? Trudeau stuck our president in the back. That will not stand.”

PoliZette writer Kathryn Blackhurst can be reached at [email protected]. Follow her on Twitter.