U.S. President Donald Trump escalated Washington’s trade dispute over foreign digital levies, warning late Monday that the United States will impose “substantial additional tariffs” on the exports of any country that maintains digital services taxes, legislation or regulations that he says discriminate against American technology companies. In a Truth Social post, Trump added that his administration could also restrict overseas sales of U.S. advanced technology and semiconductor chips unless the measures are withdrawn. Separately, people familiar with the matter told Reuters the administration is weighing visa sanctions on European Union and member-state officials responsible for enforcing the bloc’s new Digital Services Act. The possible travel bans would mark a rare use of personal sanctions against allies and intensify pressure on Brussels as the law enters its enforcement phase. Digital services taxes have been adopted or proposed by several European nations, while the EU’s Digital Services Act and Digital Markets Act tighten oversight of online platforms such as Alphabet’s Google, Meta, Apple and Amazon. Brussels argues the rules apply globally and are aimed at curbing market abuses, not targeting U.S. firms. Trump’s latest threats revive a longstanding trade irritation and raise the prospect of a new round of tariffs and export controls that could widen transatlantic economic tensions.