- On Friday, Trump is scheduled to attend the annual summit and meet with leaders from the U.K., Canada, Japan, Italy, Germany and France.
- In a tweet, Trump accused Canada and France of levying "massive tariffs" and creating "non-monetary barriers."
- He has repeatedly lashed out at Canada's Trudeau on Twitter. Last week, Trump said Canada's trade policies have treated American farmers "very poorly for a long period of time."
In a tweet, Trump accused the U.S. allies of levying "massive tariffs" and creating "non-monetary barriers."
@realDonaldTrump: Please tell Prime Minister Trudeau and President Macron that they are charging the U.S. massive tariffs and create non-monetary barriers. The EU trade surplus with the U.S. is $151 Billion, and Canada keeps our farmers and others out. Look forward to seeing them tomorrow.
French President Emmanuel Macron in a tweet had threatened to exclude U.S. from a joint statement issued every year at the G-7 summit.
"The American President may not mind being isolated, but neither do we mind signing a 6 country agreement if need be. Because these 6 countries represent values, they represent an economic market which has the weight of history behind it and which is now a true international force," Macron tweeted.
On Friday, Trump is scheduled to attend the annual summit and meet with leaders from the U.K., Canada, Japan, Italy, Germany and France. The forum of industrialized economies takes place in Quebec this year.
Also on Thursday night, Trump attacked Trudeau over the dairy industry, claiming that Canada is "killing" U.S. agriculture.
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!
Canada bought 31 percent of U.S. milk exports and 5.3 percent of its cheese exports in 2016, according to data from MIT's Observatory of Economic Complexity.
Tensions between the U.S. and many of its allies were already high after the Trump administration decided late last month to impose tariffs on imports from Canada, Mexico and the European Union, citing national security concerns.
Trudeau responded at the time that it's offensive for the Trump administration to claim that Canada poses a security threat to the United States, given the "the thousands of Canadians who have fought and died alongside their American brothers in arms."
Canada also said it would levy "dollar-for-dollar" retaliatory measures against the U.S. tariffs. Other countries pledged to impose their own retaliatory tariffs.
Trump has repeatedly lashed out at Trudeau on Twitter. Last week, Trump said Canada's trade policies have treated American farmers "very poorly for a long period of time."
@realDonaldTrump: Canada has treated our Agricultural business and Farmers very poorly for a very long period of time. Highly restrictive on Trade! They must open their markets and take down their trade barriers! They report a really high surplus on trade with us. Do Timber & Lumber in U.S.?
Over the weekend, top economic leaders asked Treasury Secretary Steven Mnuchin to relay their "unanimous concern and disappointment" over the tariffs on steel and aluminum imports.
—CNBC's Ted Kemp contributed to this report.