Would the U.S. invade Canada?

Donald Trump ruled out using military force to annex Canada. The head of US Pacific Command called the idea of attacking Canada "preposterous." But Mark Carney called it an "extreme tail risk" that would be "irresponsible" not to prepare. We unpack the Canadian Prime Minister's eye-catching interview with the New York Times, with Stephen Saideman, a professor of political science at Carleton University’s Norman Paterson School of International Affairs, and Wendy Gilmour, Vice-Chair of the Board of the Conference of Defence Associations Institute.