Trump's message will put pressure on America's trading partners, many of whom are still trying to negotiate fair trade terms. His top economic adviser, Kevin Hassett, said on Sunday that the current offers made by other countries are not enough.

President Donald Trump has posted two new letters on his social media platform announcing tariffs on the European Union and Mexico.

President Donald Trump posted letters to the leaders of Mexico and the European Union, saying they had not done enough to head off the new tariffs.

The decision was made to impose new, higher tariffs as he claimed the countries were taking advantage of the US. The tariffs are set to begin on August 1

The European Union braced on Friday for a possible letter from U.S. President Donald Trump outlining planned duties on the United States' largest trade and investment partner after a broadening of his tariff war in recent days.

President Trump said he plans to impose blanket levies of 15% to 20% on most trading partners that haven't yet received suggested tariff rates. That would be higher than the 10% baseline currently in effect.