Trump refused to sign a previously-negotiated joint statement written by all seven countries, prompting French President Emmanuel Macron to say in a statement Sunday that "International cooperation can not be dictated by fits of anger and throwaway remarks ..."
The US president took to Twitter while on his trip to Singapore for the historic summit with North Korea to call Trudeau "Very dishonest & weak".
Describing the U.S. tariffs on European steel and aluminium as "unjustified", she left no doubt that EU nations would impose counter-measures on USA goods in response but cautioned against tit-for-tat retaliation which might lead to a trade war.
"I congratulate leaders of other countries for so crazily being able to make these trade deals so good for their countries, ' Trump said, while insisting that his relationships with Europe and Canada were 'outstanding".
May 31 - The Trump administration announces that Canada will no longer be exempt from steel and aluminum tariffs, prompting the Trudeau government to announce its own counter-measures. But the diplomatic fireworks ended up even more spectacular than anticipated.
"I have made it very clear to the President that it is not something we relish doing, but it something that we absolutely will do", Trudeau said.
President Trump on Saturday said the US would not sign the G-7 communique, and USA officials suggested Trudeau had double-crossed the president by saying one thing in private and another publicly.
President Donald Trump's fight with Canadian Prime Minister Justin Trudeau not only threatens to unravel the US's relationship with one of its oldest worldwide partners - it could also significantly damage the U.S. economy.
As he flew from Canada to Singapore on Saturday night, Mr Trump displayed his ire via Twitter, which he also employed to insult Mr Trudeau as "dishonest" and "weak". President Trump is sitting alone on one side of a table. Trudeau pulled a "sophomoric political stunt for domestic consumption" that amounted to "a betrayal", said Kudlow, who appeared on CNN's "State of the Union" and CBS' "Face the Nation".
Trump's trade adviser Peter Navarro also lashed out on Sunday at Trudeau's statements, saying they represent "bad faith". The clashes between America and Canada started right after the G7 summit.
Back home, Canada's Green Party leader flat out called Trump a bully.
"Trump mentions Canada again in a couple more tweets about trade on June 4 - "...
French President Emmanuel Macron's office reacted Sunday by saying that "international cooperation can not be dictated by fits of anger and throwaway remarks".
But Trump's headlines weren't about his first time here, it was about his parting words.
Greg Valliere, the chief global strategist at Horizon Investments, wrote Monday that the back-and-forth would most likely only cement the resolve of both Trump and Trudeau.
Trump's renewed comments on trade come amid a growing dispute between Washington and its top allies. "He is a thug using Soviet-style aggression to wage a shadow war against America, and our leaders should act like it", Sasse said.