He tweeted hours later that he had instructed US representatives not to endorse the G7 joint communique "based on Justin's false statements at his news conference, and the fact that Canada is charging massive Tariffs to our USA farmers, workers and companies".
A New York Times reporter who was present at the Trudeau press conference tweeted Sunday that he didn't understand what remarks Kudlow was referring to when the economic adviser said Trudeau stabbed the U.S.in the back.
"Very dishonest & weak", the president said.
Trudeau had announced that the G7 members - Canada, France, Germany, Italy, Japan, the United Kingdom and the US - had agreed upon a joint communiqué, or formal statement, after a hard week on trade issues.
President Donald Trump shakes hands with Canada's Prime Minister Justin Trudeau in a bilateral meeting at the G-7 summit in in Charlevoix, Quebec, Canada, June 8, 2018.
President Trump's senior trade advisor, Peter Navarro, had even worse criticism of Trudeau. "We make commitments and keep them", the presidency said, adding that "France and Europe maintain their support for this statement".
After Trump's angry tweets, Trudeau's office issued a brief response: "We are focused on everything we accomplished here at the G7 summit".
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Officials from European delegations quickly leaked copies of the joint statement, and it was published online moments before Mr Trump tweeted.
Trump administration officials on Sunday accused Canadian Prime Minister Justin Trudeau of stabbing President Trump in the back, blaming him for the president's refusal to endorse a joint statement with other world leaders.
The accusation came "right from Air Force One", said Navarro, as Trump was flying to Singapore for a historic summit with the dictator of North Korea.
At a rare solo news conference before heading to Asia, Trump said he pressed for the G-7 countries to eliminate all tariffs, trade barriers and subsidies in their trading practices.
Summit host and Canadian prime minister Justin Trudeau hailed a joint statement highlighting the importance of "free, fair and mutually beneficial trade and investment" and said the G7 would "continue to fight protectionism". In response to USA duties, Canada has already issued its own tariff threats, which Trudeau said would go into effect on July 1.
Earlier that day, Trump also tweeted: "Please tell Prime Minister Trudeau and President Macron that they are charging the USA massive tariffs and create non-monetary barriers".
Larry Kudlow, director of the National Economic Council, lashed out at Trudeau as "amateurish" and "sophomoric" for a news conference he gave after Trump left the G7 summit on Saturday.
The US President addressed the subject of global trade during an impromptu news conference at the summit Saturday, saying that he did not want to see other countries take advantage of the US over trade. A frenzied effort in May to reach a deal that could pass the current U.S. Congress by the end of this year has stalled, in part after Trudeau's final push ran up against Trump's insistence on a five-year sunset clause that would see the pact renegotiated or killed after five years. I do not know where we go from here.