While en route to a Singapore summit with North Korean leader Kim Jong Un after leaving the G7 meetings early, Trump attacked Trudeau's press conference with a series of tweets in which he called the Canadian Prime Minister "meek and mild" and "very dishonest and weak".
Following the G7 meeting, Canada's Prime Minister Justin Trudeau announced that Canada will "not be pushed around" by the US with its decision to slap tariffs on some imports from Canada and other countries.
He also says Canadians expect him to foster with Trump "a constructive, productive relationship in which we can work together, that is based on not insulting and disrespecting each other".
When Trump's tweets withdrawing support from the G7 statement hit on Saturday, the prime minister's office said Trudeau had not said anything in his closing news conference he has not said to Trump before.
As Derek Scissors of the American Enterprise Institute points out, the trade agreement could extend beyond North America to Britain, which is seeking a new trade arrangement as it exits the European Union, and the Philippines and Taiwan, which are pressured by China.
While Ottawa is considering options for retaliatory tariffs against Washington, Canadian citizens have chose to take the matter of retaliating against the USA tariffs on steel and aluminum into their own hands.
"He was the one who let Crimea get away - that was during his administration", he said, adding, "Crimea was let go during the Obama administration and Obama can say all he wants, but he allowed Russian Federation to take Crimea". The only way Trump could've made Trudeau look better on the world stage is if he faked choking on a burger this weekend and then let Trudeau perform the Heimlich manoeuvre.
Timeline of trade tensions since the US decision to impose tariffs on steel and aluminium imports
Foreign Affairs Minister Chrystia Freeland was measured Sunday, saying only that "Canada does not believe that ad hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries".
"Why should I, as President of the United States, allow countries to continue to make Massive Trade Surpluses, as they have for decades, while our Farmers, Workers & Taxpayers have such a big and unfair price to pay?"
"He really stabbed us in the back".
Trump attacked the Canadian leader after withdrawing US approval of the joint communique issued at the close Saturday of the Group of Seven summit in Charlevoix, Quebec. From promoting democracy and to fighting terrorism, "we're on the same page". Canada hosted this summit for EU, France, Italy, Germany, Japan, United Kingdom and USA.
"They come upon you abruptly and they dissipate just as quickly", he said Monday.
Mr. Trump insisted relationships with allies were a "10" just before he left the summit.
A senior diplomatic source with knowledge of the discussions also said the photo captured an argument on the trade section of the communique. 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".
Twitter, which does not usually take time to comment on such instances, soon saw former Arkansas Governor Mike Huckabee tweeting, "Breaking wind from CNN!"
Lucey reported from Singapore and Thomas from Washington.