At the same time, Mr. Trump has yet to grab the carrots that Europe has dangled in front of him. Ursula von der Leyen, the president of the European Commission, offered on Monday to drop tariffs on imported American cars and other industrial products to zero if the U.S. does the same, a “zero-for-zero” strategy. Asked about that possibility, Mr. Trump said “it’s not” enough to make him back down.

Instead, the administration appears to be standing by its spate of recently-announced tariffs, at least for now. The Trump administration has announced 20 percent across-the-board levies on the E.U., in addition to even higher ones on steel, aluminum and cars.

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