Canada will impose counter-tariffs of up to 50% on nearly C$28bn ($20bn; £15bn) of US products, including steel, furniture, fresh tuna and cotton T-shirts, in response to tariffs imposed by President Donald Trump’s administration on Canadian goods. The measures, covering around 700 products, are designed to match the Canadian goods targeted by the US and will take effect on 8 September. Finance Minister François-Philippe Champagne called the response proportionate and strategic and announced an additional C$7.5bn in support programmes for workers and businesses affected by the US tariffs. The escalation threatens to raise costs across deeply integrated supply chains and potentially increase prices for businesses and consumers on both sides of the border. Trump accused Canada of exploiting the US and said it was not a state, while also suggesting he could rename Lake Ontario Lake America. Prime Minister Mark Carney accused Trump of seeking to destroy Canadian auto, steel and aluminum industries. Some officials later expressed interest in restarting negotiations. The dispute also raises questions about the future of the USMCA (North American trade agreement), involving Canada, the US and Mexico, as President Claudia Sheinbaum sent economy secretary Marcelo Ebrard to Washington for emergency talks.