特朗普威胁对加拿大商品征收35%关税，加拿大总理卡尼回应将继续磋商。美股三大指数维持跌势，标普500指数跌超0.3%。

Group 1 - The core point of the article highlights President Trump's threat to impose a 35% tariff on Canadian goods, prompting a response from Canadian Prime Minister Carney to continue negotiations [1] - The U.S. stock market indices, including the S&P 500, are experiencing a downward trend, with the S&P 500 index declining by over 0.3% [1]