IP - Canada and China have responded to U.S. President Trump's tariffs by implementing their tariffs on American goods. Canada imposed a 25% tariff on U.S. products, with Prime Minister Justin Trudeau criticizing the U.S. tariffs as "a very dumb thing to do." China's retaliation comes after Trump announced additional tariffs of 20% on its goods. This escalation has raised concerns about a potential trade war.