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KARLSRUHE, GERMANY - DECEMBER 14: German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel speaks to CDU party delegates at the annual CDU federal congress on December 14, 2015 in Karlsruhe, Germany. The CDU is meeting following a dramatic year in which Germany admitted approximately one million migrants and refugees under an open-door policy spearheaded by Merkel. A growing number of CDU members think Merkel has gone too far and see the influx as a burdensome challenge that should have been capped sooner. (Photo by Thomas Lohnes/Getty Images)

KARLSRUHE, GERMANY - DECEMBER 14:  German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel speaks to CDU party delegates at the annual CDU federal congress on December 14, 2015 in Karlsruhe, Germany. The CDU is meeting following a dramatic year in which Germany admitted approximately one million migrants and refugees under an open-door policy spearheaded by Merkel. A growing number of CDU members think Merkel has gone too far and see the influx as a burdensome challenge that should have been capped sooner.  (Photo by Thomas Lohnes/Getty Images)