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 ramped up a burgeoning feud with two of the United States's closest allies, Canada and France, on Thursday as he prepared to head to the Canadian province of Quebec for what is expected to be a tense summit this week.

In a tweet on Thursday night, Trump accused Canadian Prime Minister Justin Trudeau of being "indignant" in his protests against steep U.S. tariffs imposed last week on steel and aluminum imports.

"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!" Trump tweeted.

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 tweet followed shortly after he called out both Trudeau and French President Emmanuel Macron over what he suggested were Canada's and Europe's one-sided trade arrangements with the U.S.

The president went on to slam the European Union and Canada in a subsequent tweet, urging them to take down their trade barriers.

"Why isn’t the European Union and Canada informing the public that for years they have used massive Trade Tariffs and non-monetary Trade Barriers against the U.S. Totally unfair to our farmers, workers & companies. Take down your tariffs & barriers or we will more than match you!" Trump wrote.

Why isn’t the European Union and Canada informing the public that for years they have used massive Trade Tariffs and non-monetary Trade Barriers against the U.S. Totally unfair to our farmers, workers & companies. Take down your tariffs & barriers or we will more than match you! — Donald J. Trump (@realDonaldTrump) June 7, 2018

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Trump's comments were his latest attacking key U.S. allies ahead of the Group of Seven summit in Charlevoix, Quebec, which is set to begin on Friday.

The anger and frustration with the Trump administration from key U.S. allies was abundant on Thursday, with Macron suggesting that the G-7's six other members would forge a path ahead at the summit without the U.S.

"The American President may not mind being isolated, but neither do we mind signing a 6 country agreement if need be," Macron said in a tweet. "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."