[CORRECTS SPELLING OF JUNCKER -The President on the European Commission, Jean-Claude Juncker, attends a panel discussion about the future of Europe at the Europe Forum event, hosted by the Germany's WDR television and broadcast service, at the Foreign Ministry, in Berlin, Germany, Thursday, May 12, 2016. (AP Photo/Markus Schreiber)]BERLIN (AP) — Turkey and the European Union faced off Thursday over a proposed deal to let Turks travel to Europe without visas — a crucial carrot the bloc has been dangling in order to get Turkey to halt the torrent of migrants flowing from its shores to EU member Greece.