Bashing the leader of one of America's venerable allies, the White House escalated its trade tirade and leveled more withering and unprecedented criticism Sunday against Canada's prime minister, branding Justin Trudeau a back-stabber unworthy of President Trump's time.
Trudeau "kind of stabbed us in the back", Kudlow said. He called USA tariffs on its ally under the pretext of national security "kind of insulting" and said Canada would not be "pushed around". "He did a whole disservice to the whole G-7".
In their communique, the leaders of the United States, Canada, Britain, France, Italy, Germany and Japan agreed on the need for "free, fair, and mutually beneficial trade" and the importance of fighting protectionism. "We make commitments and keep them", the presidency said, adding that "France and Europe maintain their support for this (G7) statement".
"Canadians, we're polite, we're reasonable, but we also will not be pushed around", Trudeau said at the G7.
President Trump "is not going to let a Canadian Prime Minister push him around - push him, POTUS, President Trump, around - on the eve of this" North Korean Summit, Kudlow announced.
"[Trudeau] went out of his way to try to downplay tensions", said White House reporter Michael Shear.
The US President addressed the subject of worldwide trade during an impromptu news conference at the summit on Saturday, saying that he did not want to see other countries take advantage of the US over trade.
In a fiery interview, Kudlow called Trudeau's press conference a "sophomoric, political stunt for domestic consumption".
She said: "Where we disagree with our allies on something it is right that we say so, and air the issue openly and frankly".
Trudeau and Canadian Foreign Minister Chrystia Freeland later tweeted photos of the women's empowerment meeting, showing Trump's empty chair.
The US president seemed particularly incensed by Trudeau's comments in a news conference criticising Trump's decision to invoke national security to justify US tariffs on steel and aluminium imports.
"President Trump played that process in good faith", Kudlow said on CNN's "State of the Union" Sunday.
Mr. Trump said on Saturday that he had told the G7 leaders that the USA required fair access to markets and an end to unfair trade practices. That was Justin Trudeau's late father, who served several terms as Canada's prime minister, starting in the late 1960s.
"That's what weak dishonest Justin Trudeau did", he added. "Americans stand with you, even if our president doesn't", he wrote.
President Trump said he expects something will happen on trade, and that it will be positive.
Trudeau didn't respond to questions about Mr. Trump when the prime minister arrived at a Quebec City hotel Sunday for meetings with other world leaders, though Freeland later told reporters that "we don't think that's a useful or productive way to do business".
In his interview Sunday, Kudlow said he personally negotiated with Trudeau during the two-day G7 summit in Quebec's Charlevoix region and insisted the USA agreed to the language in the communique in good faith.
The PM also said she had spoken to Mr Trump "briefly" at the summit about his upcoming visit to the UK.
Pierre Lampron, the president of Dairy Farmers of Canada, shot back at Trump's claims about his industry.