Canada is the USA's largest trading partner. When Trump tried tariffs on our goods as a negotiation tactic during the NAFTA negotiations, Canada responded by putting tariffs on American goods. It hurt the USA more than us.
USA's inflation will go up quickly with Trump's dumb 10% tariff idea. Trading partners around the world will put tariffs on American goods in retaliation as well. It will cause the USA to spiral into a recession.
It's a massively stupid idea. China won't play nice like us.