President Donald Trump threatened to revive his global trade wars Friday, adding a fresh dose of chaos to trade relationships that had calmed somewhat in recent weeks.

The president had focused his attention on a trip to the Middle East and a tax bill on Capitol Hill. But Friday, Trump returned to tariffs, saying he would apply a steep tax to European exports starting in just over a week and warning Apple and other phone manufacturers that their products made outside the United States would face a 25% tariff, most likely beginning next month.

The threats caused stocks to sink and renewed risks to the global economy, as similar announcements made by the president have in recent months. If enacted, economists said the tariffs would pose significant costs for Apple, one of the world’s most

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