The US is imposing a 17% tariff on most tomatoes imported from Mexico with immediate effect, the government said. The duty came into force after the US withdrew from a long-standing agreement with its southern neighbour,

President Donald Trump in recent days slapped tariffs as high as 50% on dozens of countries, restoring the type of aggressive trade policy that sent stocks plummeting a few months ago. The new round of levies prompted little more than a shrug on Wall Street.