The Globe and Mail reports in its Tuesday edition that U.S. dairy exporters are demanding Canada rewrite its rules around who can import cheese, milk and other products as President Donald Trump threatens to impose a 35-per-cent tariff on Canadian goods beginning Aug. 1. The Globe's Kate Helmore writes that last week, Mr. Trump sent a letter to Prime Minister Mark Carney threatening to impose more tariffs on a number of Canadian goods and complaining about protectionist measures on supply-managed products such as dairy. U.S. exporters want Canadian retailers and food-service companies to be able to import dairy tariff-free under the U.S.-Mexico-Canada agreement. Canada's rules allow only processors and distributors to import U.S. dairy products without facing levies that can surpass 250 per cent. A limited amount can be imported without duties under a tariff rate quota, or TRQ. The U.S. has long argued Canada's TRQ licence rules are a breach of USMCA, and are why exporters have been unable to sell into the Canadian market at the volumes negotiated in 2018. Canadian grocers and distributors also say the system benefits the dairy industry and reduces the variety of products available on shelves from U.S. producers.