It is my understanding that neither Canada nor the USA allows for the importation of products containing THC, so I don't see this as having anything to do with Canada. Perhaps I do not understand what you mean to say?
Canada has pulled American liquor from sales as a tariff retaliation, so Kentucky bourbon sales have dropped considerably. Thus we have the senator from Kentucky trying to kill off domestic competitors for Kentucky liquor.
Since tariffs were placed on Canada, Canada has been boycotting American industries like whisky, specifically because they are significant industries in Republican-controlled states. I don't know whether this move against THC is a response to that pressure, but that's the reference.
You're missing the parent comment's point. Bourbon sales are way down significantly because the largest liquor importer on the continent (Liquor Control Board of Ontario) has banned the import of all American products. Many other provinces followed suit.
