What's in Reagan advert that's caused US-Canada trade talks collapse?

US-Canada trade talks collapsed after an ad featuring Ronald Reagan's remarks on tariffs led to President Trump stopping negotiations with Canada. The radio address from 1987 focused on how tariffs harm Americans and can trigger trade wars. The ad, sponsored by Ontario, quotes Reagan's stance on free trade, emphasizing the importance of fair competition over protectionist measures, leading to a dispute on its portrayal by President Trump and the Ronald Reagan Foundation.