CUSMA: How To Win Against Trump.

In short, take an economic theory, that of tariffs, that has absolutely zero credibility under sound economics and leverage it as the initiator. In other words, stop being a reactive Canada and go on the offence for a prescriptive period. 

Canada should impose at least 25% tariffs on all CUSMA-compliant goods manufactured in the States. Breach the damned agreement just like Trump does. Sure, Canadian companies will be hurt, but American exporters will be hurt even more. Short-term pain for long-term gain, to quote Crosbie. Hit the United States hard right where they live in the pocketbook. That'll get the asshole's attention, but good. And the American business lobby will come down on Trump like a ton of bricks. Fuck that POS.