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BERLIN, GERMANY - JANUARY 24: European Council President Donald Tusk arrives for the state memorial ceremony for the late former German President Roman Herzog at the Dom cathedral on January 24, 2017 in Berlin, Germany. Herzog served as German president from 1994 to 1999 and died on January 10, 2017. (Pool Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - JANUARY 24:  European Council President Donald Tusk arrives for the state memorial ceremony for the late former German President Roman Herzog at the Dom cathedral on January 24, 2017 in Berlin, Germany. Herzog served as German president from 1994 to 1999 and died on January 10, 2017.  (Pool Photo by Sean Gallup/Getty Images)