He followed up by tweeting: "PM Justin Trudeau of Canada acted so meek and mild during our @G7 meetings only to give a news conference after I left saying that, "US Tariffs were kind of insulting" and he "will not be pushed around".
May 25 - Trump reportedly quips to Trudeau, "Didn't you guys burn down the White House?" after Trudeau protests the USA invoking "national security" as its reason for imposing tariffs on Canadian steel and aluminum.
Trump continued tweeting Sunday evening about Trudeau, accusing Canada of making $100 billion in trade with the U.S.
I left before the end of the summit to embark on a marathon journey from Canada to Singapore.
Sen. John McCain, who is battling brain cancer in his home state of Arizona, called out the President in a tweet Saturday for not siding with USA allies at the summit. "President Trump did the courtesy to Justin Trudeau to travel up".
"The U.S. pays close to the entire cost of North Atlantic Treaty Organisation - protecting many of these same countries that rip us off on trade (they pay only a fraction of the cost - and laugh!)", he tweeted. We protect Europe (which is good) at great financial loss, and then get unfairly clobbered on Trade.
How did the spat unfold?
While at the Summit in Quebec, Canada, Trump blasted the foreign leaders who were there with him as they jointly were supposed to come up with new solutions and possibilities for trade.
OTTAWA -Political figures on both sides of the Canada-U.S. border are coming to the federal government's defence amid ongoing attacks from U.S. President Donald Trump, who has taken to Twitter several times over the last few days to insult Prime Minister Justin Trudeau and make threats about more tariffs.
Trudeau responded with tough words of his own at a press conference later Saturday, reiterating that Canada would move forward with a slew of tariffs in response to Trump's steel and aluminum tariffs.
"It's a betrayal. He's double-crossing", he said Sunday.
It was all smiles during a photo opportunity at the G7 Summit.
French President Emmanuel Macron's office reacted Sunday by saying that "international cooperation can not be dictated by fits of anger and throwaway remarks".
"Let's be serious and worthy of our people", a statement from the French presidency said. "We make commitments and keep them". Canada does indeed impose a 270% tariff on dairy that has kept many USA dairy products from making their way from the U.S.to Canada. Merkel, whose nation is a G-7 member, also said the European Union would "act" against the US trade measures, which European leaders regard as going against the rules of the World Trade Organization. U.S. officioals too, took on Mr Trudeau.
That's why reducing non-tariff barriers between Western allies was a more important sticking point in the TTIP negotiations.