Of course, pointing fingers at "who started it" doesn't resolve the fundamental problem. Neither Brussels nor Trump have an understanding of how trade relations work. If the European Union wants to appropriately respond to new tariffs on steel and aluminum, it should actually reduce tariffs on US imports. This would send a clear sign that the belief in free trade in Europe is consistent, no matter how much Trump uses mercantilism for political point-scoring with his base.
If there is to be a trade war, it should be a trade war to see who can slash tariff barriers the most.
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