US President Donald Trump issued a volley of tweets on Monday venting anger on some of Washington's closest North Atlantic Treaty Organisation allies over the United State's trade deficit, following a divisive G7 meeting in Canada.
"Stay calm, keep moving forward, be the adult and come back with meaningful and substantive policies at the table that makes sense to arrive at an appropriate NAFTA outcome".
But the criticism left a former Canadian prime minister, Stephen Harper, stumped. Mulroney began working with Trudeau a year ago. The United States has very high tariffs on other products: 350 percent on smoking tobacco, 130 percent on peanuts and 99 percent on prepared groundnuts.
Trump's post G7 tweets also revisited an old bugbear - the funding of the North Atlantic Treaty Organisation military alliance.
"The president, coming late, stands before the cameras and says, "Why don't we add Russian Federation to the group".
Our Tariffs are in response to his of 270% on dairy!" the US president tweeted.
Of the 32 states that count Canada as their biggest export destination, 20 voted for Trump in the 2016 election.
Republican Senator Jeff Flake of Arizona, a frequent Trump critic, referenced the vitriol emanating from the administration in a tweet: "Fellow Republicans, this is not who we are". Pre-summit reports from the White House suggested that the president even considered skipping the summit altogether.
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Mr Trump's looming summit with North Korean leader Kim Jong-un heightened tension, and White House economic adviser Larry Kudlow accused Mr Trudeau of betraying Mr Trump with "polarising" statements on trade policy that risked making the USA leader look weak on the eve of the historic North Korea summit.
"Canadians are polite and reasonable but we will not be pushed around", Trudeau told reporters on Saturday.
President Donald Trump accused Prime Minister Trudeau of acting "meek and mild" during meetings at the G7 Summit, only to attack the U.S. at a news conference.
"POTUS is not gonna let a Canadian prime minister push him around", Trump's chief economic adviser, Larry Kudlow, said on CNN's "State of the Union".
Trump also said he might double down on import tariffs by hitting the sensitive auto industry, throwing the G7's efforts to show a united front into disarray.
Kudlow, in a separate TV appearance, said Trudeau was "polarizing" and "really kind of stabbed us in the back". "He did a great disservice to the whole G7". "Using that type of language is not professional, it's not called for, and I tell you, I was deeply disappointed to see this lack of professionalism on his part".
The U.S. does maintain some of the lowest tariffs in the world - if not the lowest - with an average levy of 2.8% on all goods, according to a ranking from the World Trade Organization. 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". "We don't think that that is a useful or productive way to do business", she said.