Dow Jones futures will open Sunday evening, along with S&P 500 futures and Nasdaq futures. President Donald Trump announced Saturday that he'll impose 30% tariffs on the European Union and Mexico, with overall Trump tariffs set to top April 2 Liberation Day levels.

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.

Mexico did not face a new tariff on April 2, the day of Trump's so-called "Liberation Day" tariff rollout. There remains a 25% tariff on non-USMCA-compliant goods from Canada and Mexico, as well as a 50% tariff on steel, aluminum and derivative products.

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.