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The article discusses the dispute between German Chancellor Angela Merkel's Christian Democratic Union (CDU) and the Christian Social Union (CSU) over the status of asylum-seekers who are registered to stay in other European Union (EU) countries but travelled to Germany. Topics discussed include the CSU's frustration over Merkel's leadership style and demand that secondary migrants be checked and turned back at German borders and Merkel's agreement to tighten Europe's external frontiers.