Washington DC - Republican members of Congress joined forces behind President Donald Trump to blame Canadian Prime Minister Mark Carney for ongoing tensions with Ottawa.

Since Carney walked away from negotiations due to a proposed deal he labeled "unfair" and "uneconomic" he has suffered a barrage of attacks against him by the American right, while enjoying general popularity and bipartisan support at home.

In a series of interviews with CBC over the fortnight since trade talks fell apart and Trump moved forward with his 50% tariff threat, GOP figures threw their support squarely behind Trump, laying blame solely at the feet of Ottawa.

"It's a war that is perpetuated by Canada," Texas Republican August Pfluger told CBC News. "The Canadians need to get reasonable. They've taken advantage of the United States for a long time."

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Congressman Brian Mast, from Florida, touted a similar line: "They were given the best possible deal, more generous than anybody else across the globe, and it's something that they turned their back on."

Speaking to CBC last week, US Trade Representative Jamieson Greer took aim at Carney's government, claiming that "Canada already had the best tariff treatment of any country in the world and chose to walk away from a deal that offered lower tariffs."

"We have an economic policy that aligns with US aspirations," he said. "There is an opportunity for Canada to participate in the reindustrialization of North America."

While angering Washington, Carney is enjoying broad support at home for his handling of the Trump administration, winning big in a series of crucial elections this week.

Ontario Premier Doug Ford last week also threw his support behind Carney's approach, launching an all-out attack on Trump and his officials and declaring the president can "kiss my a** as far as I'm concerned."