US President Donald Trump has announced the immediate termination of all trade negotiations with Canada, citing a controversial advertisement by Ontario that used excerpts from Ronald Reagan's 1987 speech to criticize tariffs. Trump claimed the ad was 'fraudulent' and 'fake,' and accused Canada of misrepresenting Reagan's words. The ad highlighted Reagan's opposition to tariffs, stating that they 'hurt every American' and lead to retaliation and trade wars, which in turn cause market shrinkage, job losses, and economic decline. The original speech by Reagan emphasized the importance of free trade, warned against high tariffs, and referenced historical lessons from the Great Depression. The controversy escalated after Trump accused Ontario of editing Reagan's speech without permission, and he threatened to increase tariffs on Canada by 10% over and above current levels, citing the ad as a reason. The Canadian government, including Prime Minister Mark Carney, responded cautiously, emphasizing readiness to resume talks and the importance of diplomacy. The dispute also involves legal battles, as the Trump administration seeks to overturn tariffs deemed unconstitutional by US courts. The controversy has strained US-Canada trade relations amid broader tensions over tariffs and trade policies.