The president-elect’s threat to hit Canada, Mexico and China with new tariffs is already rocking business and diplomatic relationships and could topple the trade pacts he signed in his first term. Trump, Donald J, Customs (Tariff), Protectionism (Trade), United States Economy, United States International Relations, United States Politics and Government, International Trade and World Market, Canada, China, Mexico The president-elect’s threat to hit Canada, Mexico and China with new tariffs is already rocking business and diplomatic relationships and could topple the trade pacts he signed in his first term. NYT > Business