US equity markets are extending early losses following the Trump administration threatening retaliation against the European Union in response to efforts to tax American tech companies.The White House singled out prominent companies, including Accenture Plc, Siemens AG and Spotify Technology SA, as possible targets for new restrictions or fees.“If the EU and EU Member States insist on continuing to restrict, limit, and deter the competitiveness of U.S. service providers through discriminatory means, the Uni ...