U.S. President Donald Trump's tariff decisions since he took office on January 20 have shocked financial markets and sent a wave of uncertainty through the global economy. Here is a timeline of the major developments: February 1 - Trump imposes 25% tariffs on Mexican and most Canadian imports and 10% on goods from China,

Businesses and states had sued the government, saying the president didn’t have the authority to impose the levies.

A US federal court has blocked President Donald Trump's sweeping global trade tariffs, in a major blow to a key component of his economic policies. The Court of International Trade ruled that an emergency law invoked by the White House did not give the president unilateral authority to impose tariffs on nearly every one of the world's countries.