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In this Sept. 4, 2015 file photo a migrant holds up a poster of German Chancellor Angela Merkel before starting a march out of Budapest, Hungary, towards Austria. In 2015, Merkel was the face of a welcoming approach to migrants as people fleeing conflicts in Syria and elsewhere trekked across the Balkans, allowing in hundreds of thousands and insisting that "we will manage" the influx, but running into resistance both at home and among European partners. (AP Photo/Frank Augstein, file)