Mark Carney has been sworn in as Canada's new prime minister, succeeding Justin Trudeau, amid significant challenges such as a trade conflict with the U.S. and looming federal elections. The trade tensions have been intensified by U.S. President Donald Trump's demands for increased NATO defense spending, pressuring Canada and other allies to reconsider their military budgets. As Carney takes office, he is expected to call for a general election soon, which will be a critical test for the Liberal Party in addressing both international and domestic issues.