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The refugee situation was not the height of Merkel's politicking for sure, she was a being humanist. However, this has nothing to do with that. You can't deny that Trump is dismantling a system that many American greats from both sides of the isle have built. Whether or not that is a good idea for the future of the USA is the question that is open to disagreement. Given how vast American interests (and post WWII advantages) are worldwide, my view is that isolationism harms those interests. Eg: Turning Europe against the US.