The US will impose a 35pc tariff on all imports from Canada effective on 1 August, President Donald Trump said in a 10 July letter to Canadian prime minister Mark Carney. The letter, which Trump posted on social media, noted that Canada previously planned retaliatory tariffs in response to the US' first tariff threats in the spring. He repeated his earliest justification for the tariffs — the illegal smuggling of fentanyl into the US from Canada — and said he would consider "an adjustment" to the tariffs if Canada worked with him to stop that flow.

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