Canadian hockey fans began booing the American national anthem at Bell Centre in Montreal when Team USA played there on Saturday — sparking three fights to break out in the first nine seconds of the game, which the US won 3-1 with Canadian Prime Minister Trudeau in attendance.

Chantal Kreviazuk, who performed the Canadian anthem prior to the 4 Nations Face-Off title game Thursday changed a lyric as a rebuke to President Trump's repeated remarks about making the country the 51st state.

President Donald Trump has spoken repeatedly about turning Canada into the 51st state. Canadians are not fans of the idea.