The Digital tax was always going to cause problems, it was heading to court under the USMCA anyway. That’s just an excuse, it seems Carney hit some other tripwire that Trump doesn’t like and it’s not Dairy either. Remember Trump rarely uses a computer, and seldom reads an email or briefing document. Everything is by phone or by text, so this is likely something some nut job friend of his put him up to.
Or - hear me out - there’s no real reason other than he doesn’t like us because we don’t like him. Elbows at ease.