President Donald Trump threatened to prohibit the sale of Canadian-made Bombardier airplanes in the US if they are not manufactured there. This warning came hours before Canada imposed retaliatory tariffs on US products. The tariffs, valued at $20 billion, took effect at 12:01 am on Tuesday.

Canada's prime minister has indicated that the country will respond in kind to any future trade actions by Trump. The dispute marks a new chapter in the escalating trade war between the two countries. The tariffs include a doubling of taxes on certain products.

Further details on the trade dispute and tariffs are available from the source, including the specific products affected by the new tariffs.