Just before Canada’s first World Cup match, flag bearers from host nations walked out. The US flag appeared, and then boos started from the crowd. The episode follows a trend that started last year at sporting events after Trump's repeated threats to annex Canada and U.S. tariffs came into effect. We speak to sports journalists on both sides of the border about the the politics of protest at sporting events. We also hear from a Canadian politician discouraging fans from booing as U.S.-Canada relations remain strained.