Flavio Volpe, president of Canada's Automotive Parts Manufacturers Association (APMA), mocked President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE after he threatened to create new tariffs on automobiles on Saturday, saying Trump would end up hurting Americans.

"So.... you’re suggesting using a National Security regulation to charge $8B in tariffs to *American* consumers who buy 1 million cars made by American automakers, containing 60% American parts content, because of the price of milk in Windsor?" Volpe wrote.

So.... you’re suggesting using a National Security regulation to charge $8B in tariffs to *American* consumers who buy 1 million cars made by American automakers, containing 60% American parts content, because of the price of milk in Windsor?



Where do I start? https://t.co/AxVLVEGEBn — Flavio Volpe (@FlavioVolpe1) June 9, 2018

Volpe's comment came after Trump said he would not endorse a joint communique signed with the other Group of Seven (G-7) members at this weekend's summit, and appeared to threaten to impose further tariffs on the country.

Based on Justin’s false statements at his news conference, and the fact that Canada is charging massive Tariffs to our U.S. farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market! — Donald J. Trump (@realDonaldTrump) June 9, 2018

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.” Very dishonest & weak. Our Tariffs are in response to his of 270% on dairy! — Donald J. Trump (@realDonaldTrump) June 9, 2018

Trump's decision not to endorse the joint statement came just hours after all nations had agreed to sign the document, despite previous fears that trade tensions between the U.S. and its allies would lead to the U.S. being excluded.

Tensions over trade have ratcheted up in recent days after Trump's decision to impose tariffs on steel and aluminum.

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Mexico announced this week that it would hit the U.S. with a 20 percent tariff on pork imports in response to Trump's tariffs.

Canada and the European Union have also threatened to slap tariffs on U.S. goods such as blue jeans, bourbon and yogurt, in retaliation to Trump's tariffs.

Trump had also criticized dairy prices from Canada earlier in the week.

Prime Minister Trudeau is being so indignant, bringing up the relationship that the U.S. and Canada had over the many years and all sorts of other things...but he doesn’t bring up the fact that they charge us up to 300% on dairy — hurting our Farmers, killing our Agriculture! — Donald J. Trump (@realDonaldTrump) June 7, 2018

The decision on Saturday prompted criticism from Democrats and others, though some supported Trump's decision, including Former Arkansas Gov. Mike Huckabee (R).