My guess is that Trump does not want the Chinese manufacturers and other multinationals to just jump ship from Mexico where they currently are, to Canada. He wants the manufacturing to be in US.
Also, I think he is serious about the fentanyl trades via Canada
US Customs and Border Patrol recognizes three regions where fentanyl crosses into the country. These regions are the northern border dividing the US and Canada, the southwest border dividing the US and Mexico, and coastal and interior ports of entry.
your source shows that last year 50lbs of fentanyl was seized at the canadian border vs 20,610lbs seized at the mexican border. when looking at the total seizure of fentanyl, only .2% of it was at the canadian border. it is hard to take the fentanyl justification seriously given such a dramatic difference.
Also, I think he is serious about the fentanyl trades via Canada
US Customs and Border Patrol recognizes three regions where fentanyl crosses into the country. These regions are the northern border dividing the US and Canada, the southwest border dividing the US and Mexico, and coastal and interior ports of entry.
https://usafacts.org/answers/how-much-fentanyl-is-seized-at-...