Trump and the White House are upset that Trudeau told reporters that Canada would stand firm when it came to new US tariffs and "not be pushed around".
Leaders from Italy, the United Kingdom, Germany, France, the European Union and Japan attended a tense meeting this past Friday and Saturday at the G7 summit.
During a press conference after the summit, Canadian Prime Minister Justin Trudeau flatly rejected a proposal by the White House to insert a sunset clause in a re-negotiated North American Free Trade Agreement.
The Illinois Democrat acknowledged that Trudeau's tough talk with Trump may play well domestically, but said it would have longer-term negative implications.
Peter Navarro said on "Fox News Sunday" that's what Trudeau did to Trump at the end of the Group of Seven nations meeting in Canada over the weekend.
After one White House adviser said there was "a special place in hell" for foreign leaders like Canadian prime minister Justin Trudeau, and another said Trudeau "stabbed us in the back", Canadian leaders offered a measured - even polite - response.
Kudlow was particularly offended that Trudeau would say this ahead of Trump's North Korean summit. "Very dishonest & weak", he said of Trudeau.
Navarro called Trudeau's comments "nothing short of an attack on our political system". Canadians, he said, "will not be pushed around".
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The couple later joined other members of the royal family on the palace's front balcony to watch the Royal Air Force fly by. The next time the public is likely to see Prince Louis will be at his christening later this summer.
Trump slams Trudeau's post summit remarks as 'very dishonest & weak'
Trump did not indicate that he had received any concessions in his negotiations on trade at the summit. Trump tweeted from on board Air Force One, just hours after leaving the G7 summit .
Sen. Dianne Feinstein (D-Calif.) said it was wrong for Trump to pull out of the joint G7 communique that would have showed solidarity with America's best allies. In response to US duties, Canada has already issued its own tariff threats, which Trudeau said would go into effect on July 1.
Kudlow also insisted that Trudeau's remarks were created to make America look weak as Trump flies to Singapore for his meeting with North Korean dictator Kim Jong-un. "And that's what bad faith Justin Trudeau did at that stunt press conference".
Trudeau also said Canada "will not be pushed around" byt its mighty USA neighbor. "It's going to stop, or we'll stop trading with them".
Canada's foreign minister, Chrystia Freeland, said her country "does not conduct its diplomacy through ad hominem attacks".
Kudlow repeatedly charged Trudeau with the "betrayal" of Trump and other leaders of the G-7.
"They fully understand where I am coming from".
Canadian Prime Minister Justin Trudeau has closed the G7 summit by stating he "won't be pushed around" by Donald Trump on trade.