Trump also says he is using tariffs to "combat the scourge of fentanyl", a powerful drug that causes tens of thousands of overdose deaths in the US each year. His administration says chemicals used to make the drug come from China, while Mexican gangs supply it illegally and have fentanyl labs in Canada.

President Donald Trump’s use of tariffs in his second term defies many historical norms, say economists and historians.

President Donald Trump is planning to impose reciprocal tariffs on U.S. trading partners to match tariffs on imports to those imposed on American exporters by foreign countries.