But the president insisted that's not true. "It's just a cheap shot", he said. "We strive to reduce tariff barriers, non-tariff barriers and subsidies".
The outburst against Mr Trudeau, and by association the other G-7 members, is only the latest incident in which Mr Trump has clashed with America's closest allies, even as he has had warm words for autocrats like Mr Kim and Russia's Vladimir Putin. He reiterated his longstanding view that the USA has been taken advantage of in global trade, adding, "We're like the piggy bank that everybody's robbing, and that ends". U.S.A. Trade. They fully understand where I am coming from.
In recent weeks, trading partners of the United States have criticised new tariffs on steel and aluminium imports imposed by the Trump administration.
"On the issue of [tariffs and trade deficits] alone, we have allies strategically, but when it comes to trade disputes, these allies are basically robbing us blind", he said. Trump, however, accused the Canadian Prime Minister of falsehood. As "retaliatory measures" his government chose to impose their own tariffs on more than 80 types of American goods, from ketchup and strawberry jam to washing machines and plywood, effective on July 1.
Ford, a populist campaigner who has praised U.S. President Donald Trump in the past, said he stands "shoulder to shoulder" with Canada's Liberal prime minister because jobs in his province are at stake.
Kudlow said the US participated in G7 talks and bilateral talks on Nafta in good faith and that Trump had been "charming".
Donald Trump and Justin Trudeau have been at loggerheads over trade tariffs
Trudeau told reporters that he had spoken of retaliatory measures that Canada would take next month in response to Trump's decision to slap tariffs on steel and aluminium imports.
He repeatedly described his relationship with the other leaders at the summit as "a 10" and said he did not blame the other countries for their positions on trade.
"Not only is the trade deficit with Canada small, the United States runs a current account surplus with Canada", Harper, who served as head of state from 2006 to 2015, told "Sunday Morning Futures". "When I'm telling them, they're smiling at me. I blame our past leaders". "This too shall pass", tweeted the former Federal Bureau of Investigation director, who referred to Trump as a "mafia boss" in his recent tell-all, "A Higher Loyalty".
In a flurry of tweets from Air Force One, Trump - on his way toa meeting in Singapore with North Korean leader Kim Jong Un - also announced that he was withdrawing his support from the declaration. "The President could have said that, but to walk away from our allies in this way, I think, is a mistake".
"In terms of the approach that governments choose to take, Canada does not believe that ad-hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries", Freeland told reporters in Quebec City.
The summit is scheduled to begin Tuesday.