We can tariff their imports if we want to do equal damage while we destroy each other.

A system wide tariff on Canada would be a self-own by Trump as he gets so much oil from Canada. It would make literally everything in the US more expensive.

Oil is a global commodity though. The market would have to adjust by forcing the US to import from elsewhere and us to sell to others. Our systems are very integrated though ( specialized refining / pipelines ) so it would be painful and expensive for both of us.