Live updates: Canadian tariffs take effect as Trump threatens Bombardier; White House hosts 9/11 remembrance

Canada's retaliatory tariffs against the U.S. took effect at midnight Tuesday, affecting hundreds of goods including steel, aluminum, appliances, electronics, wood, pulp, and paper. The Trump administration had levied 50 percent tariffs on $27.6 billion worth of Canadian goods two weeks prior, with no negotiations reported.