He probably referring to the 25% tariffs on european automobile industry. That will hurt. A lot. However the refined man knows that america was always in an economical war against europe, despite the appearances. See Zbiniew Zbrezinzky, the grand chessboard (1997). So it wasn't a surprise at all for those who know about the true american geopolitic. Trump hit both the european europeanists (social democrats), and the european trumpists, who never believed Trump would betray them at the first occasion. And it's only the beginning. He will continue and hurt europe's economy every chance he gets. Possibly he will also make an american-russian economical alliance, which would be the finishing move against europa.