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BERLIN, GERMANY - MAY 27: Martin Schulz, chancellor candidate of the German Social Democrats (SPD) holds a speech with the topic 'Fairness - Future - Europe. Mission to the SPD' on May 27, 2017 in Berlin, Germany. Schulz defined the SPD mission ahead of federal elections in September. (Photo by Steffi Loos/Getty Images)

BERLIN, GERMANY - MAY 27: Martin Schulz, chancellor candidate of the German Social Democrats (SPD) holds a speech with the topic 'Fairness - Future - Europe. Mission to the SPD' on May 27, 2017 in Berlin, Germany. Schulz defined the SPD mission ahead of federal elections in September. (Photo by Steffi Loos/Getty Images)