Trump is clear. He wants to break Canada economically. He really, really, really, wants to destroy the country. He needs to destroy everything he cannot control and consume. It’s like Hitler/Stalin/Japan gobbling up land in WW2.
Trump sees all deals as NEEDING to be predatory. If you are not parasitically damaging to the other party, you have left money on the table and a healthy rival.
Under this mentally of attack, control, consume there is no value in having a political or economic relationship with any other country. Canada is to be eaten, not traded with.