The European Union’s top official is due to meet with President Donald Trump tomorrow in Washington. Jean-Claude Juncker — head of the EU’s executive arm — will be trying to stave off a full-blown transatlantic trade war and persuade the president not to go ahead with a threatened tariff of up to 25 percent on European auto imports. Could Junker succeed where Angela Merkel, Emmanuel Macron and Theresa May have so far failed?  

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