"He really kind of stabbed us in the back, " Kudlow said on CNN's "State of the Union, " referring to Trudeau.
The announcement and Trump's planned tariffs have also put him on a collision course with Trudeau, leader of another key U.S. ally.
The spat drew in Germany and France, who sharply criticised Trump's decision to abruptly withdraw his support for a Group of Seven communique hammered out at a Canadian summit on Saturday, accusing him of destroying trust and acting inconsistently.
"Based on Justin's false statements at his news conference, and the fact that Canada is charging massive tariffs to our United States farmers, workers and companies, I have instructed our USA reps not to endorse the communique as we look at tariffs on automobiles flooding the USA market".
Trump negotiated in good faith on the communique agreed by the other members of the G7, only to have Trudeau criticize USA policy after he left, Kudlow said. He says that we are the problem with tariffs.
Former FBI director James Comey subtly condemned President Donald Trump for attacking Canada, a long-time US ally, and its prime minister, Justin Trudeau.
U.S. President Donald Trump and other G7 leaders had a bitter exchange over trade tariffs, ratcheting tensions at a summit that he planned to leave early on Saturday before talks on climate change and the health of oceans.
"We were very close to making a deal with Canada on NAFTA, bilaterally perhaps, and then we leave and Trudeau pulls this sophomoric, political stunt for domestic consumption".
"We had some strong, firm conversations on trade and specifically on American tariffs".
"Trump did not want to be isolated", Macron said. "Our tariffs are in response to his 270 percent on dairy". Officials say Canada and Mexico have proposed member nations gather every five years to review the treaty.
"It would be with regret but it would be with absolute certainty and firmness that we move forward with retaliatory measures on July 1 applying equivalent tariffs to the ones that the Americans have unjustly applies to us", Trudeau said at a press conference closing the summit.
The president's Twitter outburst, sent as he flew to an historic meeting with North Korea's ruler Kim Jong Un in Singapore, unravelled days of work by the world's top nations in attempting to resolve a global trade dispute.
Trump's presidency has been clouded by a federal investigation into alleged Russian meddling in the 2016 presidential election, and possible collusion by his campaign.
Only hours later Trump took to Twitter to assault the Canadian prime minister's "false statements" and instructed USA representatives to renege on the United States endorsement of the joint communique.
He said he had suggested to the other G7 leaders that all trade barriers, including tariffs and subsidies, be eliminated. "He did him a favor and he was even willing to sign that socialist communique and what did Trudeau do as soon as the plane took off from Canadian airspace?"
Trump quickly responded by personally attacking Trudeau. "Trudeau stuck our president in the back and that will not stand". "I think it will be very positive", Trump said on Friday, without giving details.