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President Trump and European Commission President Ursula von der Leyen at the G7 summit in France last month. Photo: Thibault Camus/Pool/AFP via Getty Images
President Trump threatened Friday to impose "a substantial tariff" on the European Union over the bloc's penalties against U.S. technology companies.
Why it matters: It opens a new front in the transatlantic trade dispute, with Trump signaling he's willing to use tariffs to retaliate against European regulation of American tech giants.
