"They have tariffs on certain dairy and food products - 290 [to] 295 percent".
"Very dishonest [and] weak", Trump tweeted.
At his news conference, Trudeau said Canada would take retaliatory measures next month in response to Trump's decision to slap tariffs on steel and aluminum imports from Canada, Mexico and the European Union.
The U.S. had a $17.5 billion goods trade deficit with Canada - its second-largest goods trading partner - in 2017, though it did have a goods and services trade surplus of $8.4 billion previous year with its fellow North American Free Trade Agreement (NAFTA) member, according to data from the U.S. Trade Representative's office.
The G7 members are Canada, the U.S., U.K. Germany, Italy, Japan and France.
Trump had appeared cordial during the two-day summit in Quebec, but he erupted with a Twitter firestorm of criticism of Trudeau once aboard Air Force One. Reneging on the commitments agreed in the communique showed "incoherence and inconsistency", it said in a statement.
Emmanuel Macron has warned Donald Trump about "fits of anger" after the USA president refused to endorse a joint communique of G7 leaders.
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However, Sports Minister, Isaac Asiama , said the association had been "dissolved with immediate effect". Provisional measures will be put in place to run the sport in Ghana until a new body is formed.
The Brexit mess we're in | British politics | For Europe, Against the EU
EU negotiators have dismissed the idea as "magical thinking", while many Brexiteers are outraged at the idea of not fully leaving the customs union.
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LeBron James scored 33 points and Kevin Love 20 for the Cavs, who have fallen into a hole in which no team has ever emerged. A bounce here, a couple stops there, the Cavs could be leading in these finals and the conversation would be different.
Trump quickly responded by personally attacking Trudeau.
Trump, who arrived late to the first meeting on gender equality today, will leave before talks on climate change and the health of oceans, after not gaining support in his grievances over United States tariffs.
Trudeau pledged retaliatory tariffs against the USA starting July 1 because Canadians will "not be pushed around".
It comes after Trudeau explained his position at a news conference in which he outlined the difficulties in moving forward with the North American Free Trade Agreement.
Mr Trump had already threatened to divide the G7, made up of the US, France, UK, Italy, Germany, Japan and Canada, when he suggested Russian Federation should be allowed to rejoin the group. "Well, the in-factual, the non-factual part of this was they have enormous tariffs", Kudlow said.
Macron declared Thursday that no leader lasts forever, saying, "The six countries of the G-7 without the United States, are a bigger market taken together than the American market".
"What's not in good faith is when you leave there, you fly out of there, and the host Canadian prime minister starts taking whacks at you, pot-shots at you - on the eve of this Korean summit", Kudlow said.
Emmanuel Macron says Trump's tariffs are "unilateral and illegal".