A Canadian politician has said Donald Trump can “kiss my ass” after the US President threatened 50 per cent tariffs on key industries.The highly-publicised rift between the two nations has become increasingly personal over recent weeks, with Trump demanding the northerner’s “fall in line” with big brother.Talks collapsed late last week after Canadian Prime Minister Mark Carney rejected conditions he said would restrict Canada’s ability to negotiate trade agreements with other countries.The US disputes that account, accusing Ottawa of introducing new demands and abandoning earlier commitments.Washington subsequently imposed 50 per cent tariffs on more than 550 Canadian products worth about $US20 billion ($A28 billion).Canada says counter-tariffs will begin on September 8, targeting American steel, dairy products, appliances, agricultural equipment, pulp and paper, and electronics.Carney accused Washington of seeking to “destroy our major industries, including autos, steel and aluminium”. “This is the most successful automotive partnership in history,” he said.Vehicle manufacturing on both sides of the border is deeply integrated, with components regularly crossing between Canada and the US several times before a car is completed.Trump accused Canada of “ripping off” America and claimed the relationship had created a $US60 billion (A$85 billion) trade deficit.Official US figures put the 2025 goods deficit at about $A67 billion, partly offset by an American services surplus of almost $A39 billion.Trump also claimed Canada conducts 95 per cent of its business with the US. Nearly three-quarters of Canadian exports actually go to the American market.“Canada will be treated like a State no longer!” Trump wrote, again invoking his repeated suggestion that Canada should become America’s 51st state.Ontario Premier Doug Ford said Canadians were prepared to endure economic damage rather than concede to Washington.“We’re all in,” he said. “Up here, we’re at a fever pitch; everyone’s in for an economic war. They know they’re going to have to sacrifice.”Ford threatened to restrict Ontario’s exports of electricity and critical minerals if the dispute worsened. He also said Canada should consider using oil and potash as leverage.Mr Ford added the US president could “kiss my a***.”The Ontario leader also said former Republican president Ronald Reagan, an opponent of protectionism, would be “throwing up” over Trump’s tariff policies.Trump responded by attacking Ford personally, describing him as less intelligent and charismatic than his late brother, former Toronto mayor Rob Ford.After rejecting what he called a “bad deal,” Prime Minister Carney announced retaliatory tariffs effective September 8.He said these will target US steel and dairy industries, while also covering sectors like agricultural equipment, paper and electronics.The government statement released late Monday said ministers will “announce new measures to protect and support Canadian workers and businesses during these challenging times.”Carney said Monday that the goal of trade talks with Washington “has always been to get the best deal for Canadians, never a deal at any price or on any time frame.”Read related topics:Donald Trump