Ontario leader warns of ‘pain’ for US if Trump imposes tariffs on Canada

Premier of most populous province says rhetoric clouds trade relationship worth hundreds of billions of dollars

The United States will feel pain" if Donald Trump doesn't back down from his threat to impose steep tariffs on its northern neighbour, the leader of Canada's most populous province has warned.

After a tumultuous week that left Canadian leaders flailing for a coherent national response to Trump's provocations - including the suggestion that the US would annex its closest ally - the Ontario premier, Doug Ford, told the Guardian: We will never be for sale."