Fans at a Raptors game continued an emerging trend Sunday of booing the American national anthem at pro sporting events in Canada.

Fans of the NBA’s lone Canadian franchise booed the anthem after similar reactions broke out Saturday night at NHL games in Ottawa, Ontario, and Calgary, Alberta, hours after U.S. President Donald Trump made his threat of import tariffs on America’s northern neighbor reality.

After initially cheering for the 15-year-old female singer, fans booed throughout “The Star-Spangled Banner” performance. At the end, mixed boos and cheers could be heard before the crowd erupted in applause for the Canadian anthem, “O Canada.”

Fans also booed when Agasha Mutesasira began her performance of the American national anthem in Vancouver, British Columbia, on Sunday night when the NHL’s Canucks hosted the Red Wings.

Trump declared an economic emergency Saturday in order to place taxes of 25% on imports from Canada and Mexico and 10% on imports from China. Energy imported from Canada, including oil, natural gas and electricity, would be taxed at a 10% rate.

Canadian Prime Minister Justin Trudeau and Mexico’s president ordered retaliatory tariffs on goods from America in response.

NBA: The Cavaliers set a franchise record with 91 points in the first half as they romped to a 144-101 victory over the Mavericks. The Cavs set a franchise record with 26 3-pointers. ... Jayson Tatum scored 13 of his 35 points in the fourth quarter and the Celtics rallied from a 26-point deficit to beat the host 76ers 118-110. Tatum added 11 assists and seven rebounds.

NFL: The NFC beat the AFC 76-63 for its third straight Pro Bowl Games victory.

Women’s basketball: Lucy Olsen scored 28 points as Iowa topped No. 4 USC 76-69, snapping the Trojans’ 15-game winning streak.