The European Union’s top trade negotiator has signaled the bloc will continue trying to reach a deal with the U.S. after President Donald Trump threatened a 30% tariff on goods from the bloc and Mexico over the weekend.

Stocks were mixed in early trading on Monday after President Donald Trump over the weekend issued 30% tariffs on the European Union and Mexico, rekindling tensions with two of the largest U.S. trade partners and threatening to raise consumer prices.

President Trump is pushing through with his tariff agenda, unveiling a new batch of letters to country leaders outlining tariffs on goods imported from their countries beginning in August. Trump on Thursday announced a 35% tariff on Canadian goods.