President Donald Trump sent letters to the leaders of five more countries Wednesday, adding to the growing list of US trading partners for whom he has set new tariff rates.

Talks with the European Union are of particular interest, as the bloc trades even more with the U.S. than China.

Trump uses tariffs as a key tool to force changes to U.S. trade relationships, but his on-again-off-again approach has roiled markets and stoked uncertainty.

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,

WASHINGTON—President Trump reignited his global trade war Monday, renewing his threat to hit partners with punishing tariffs even as he announced a three-week extension to negotiate deals. Trump signed an executive order extending the date when his so-called reciprocal tariffs would take effect,

President Trump teases trade negotiations with multiple countries after announcing a new 50% tariff on imported copper and warning 14 nations to strike trade deals by next month.