Trump had set a very confrontational tone ahead of the summit by slapping tariffs on steel and aluminium imports from Canada and the European Union, and calling for Russian Federation to be let back into the summit.
It follows a chaotic G7 summit in Quebec at the weekend, when U.S. president Donald Trump withdrew his endorsement of a joint communique, accusing Mr Trudeau of being "dishonest and weak".
"All Justin Trudeau had to do was take the win", Navarro said.
But Kudlow probably didn't help the message he was sending to the Canadian leader by once referring to him as "Pierre Trudeau".
"Our position has not changed (on Russia)", said Adam Austen, spokesman for Canadian Minister of Foreign Affairs Chrystia Freeland.
President Donald Trump on Friday called for Russian Federation to be invited back to the G7, telling reporters the country should be at this weekend's meeting of major world leaders.
Trump made the comments in tweets from Air Force One as he headed to Singapore for his summit with North Korea's Kim Jong Un.
She conceded in an interview on German public television Sunday that the meeting's outcome "wasn't a great thing".
The comments, made after Trump had left to go to Singapore for his much-anticipated meeting with North Korean leader Kim Jong Un, infuriated the USA president.
"Kim must not see American weakness", Kudlow said.
Kudlow accused Trudeau of "pouring collateral damage on this whole Korean trip".
Other photos taken of the discussion were soon released, by the White House and the offices of other leaders.
"Don't blame Trump. It was Trudeau who started blasting Trump after he left, after the deals had been made".
White House trade adviser Peter Navarro also ripped into Trudeau on Sunday, saying there's a "special place in hell" for a world leader that double crosses Trump.
"There's a special place in hell for any foreign leader that engages in bad faith diplomacy with President Donald J. Trump".
But California Sen. Dianne Feinstein, a Democrat, said Trump wasn't just taking on Trudeau, but all of the United States' best allies by not signing the G-7 statement after a two-day meeting in Canada with leaders of the world's largest industrialized economies.
The prime minister responded by remaining above the fray. "Americans stand with you, even if our president doesn't". "That's what matters", wrote Trudeau.
He described Trudeau's actions after the G7 summit as a "sophomoric play". Our Tariffs are in response to his of 270% on dairy!
Support for Canada and its allies surfaced in the US, with Republican Arizona Sen.
In response, Canada, Mexico and the European Union said they were putting in place their own retaliatory measures. It was built over generations and is bigger than any person or dispute.
"Let us be worthy of our people", Macron tweeted in French.
"We are actually working on it".