Trump represents the Wisconsin and New York Dairy Farmers against what he perceives to be the unfairness of Canadian rules governing dairy trade. While Trump has not indicated exactly what he considers unfair about it, it is believed he is referring to the trade of ultra-filtered milk - a high protein product sometimes used in cheese and yogurt production.
After losing their buyers for the dairy product, 75 farm families in Wisconsin blame Canada, saying, their livelihood has been threatened. They may say what they want, but the root cause is a flooded global market.
Trudeau mentioned Canada prefers to have a fact-based re-negotiation of the North American Free Trade Agreement.
Those two brilliant minds can squabble all they want and farmers and anyone else can attempt to analyse the situation all they want, but inevitably it's the little guy who gets screwed.
Steve and John.