BERLIN, DEUTSCHLAND27. SEPTEMBER 2017QUELLE: AFP1. Foto The leader of Germany's social democratic SPD party Martin Schulz (L) walks past the SPD's outgoing parliamentary group leader Thomas Oppermann (front, C) and Oppermann's successor and German Labour and Social Minister Andrea Nahles during an SPD parliamentary group meeting on September 27, 2017 in Berlin.2. Foto Thomas Oppermann (L), outgoing parliamentary group leader of Germany's social democratic SPD party, and his successor, German Labour and Social Minister Andrea Nahles, give a statement after Nahles was elected SPD parliamentary group leader during a meeting on September 27, 2017 in Berlin.BERLIN, BERLIN, DEUTSCHLAND3. JULI 2015QUELLE: AFP3. Foto German Chancellor Angela Merkel (L) and Social Democrats (SPD) parliamentary leader Thomas Oppermann talk during a sitting of the Bundestag, Germany's lower house of parliament in Berlin on July 3, 2015. AFP PHOTO / ODD ANDERSENBERLIN, DEUTSCHLAND12. FEBRUAR 2017QUELLE: AFP4. Foto (L to R) Candidate for the chancellorship Martin Schulz, German Vice Chancellor and Foreign Minister Sigmar Gabriel and parliamentary group leader at the Bundestag of the social democratic SPD party Thomas Oppermann pose ahead the presidential election at the Bundesversammlung federal assembly Bundestag (lower house of parliament)on February 12, 2017 in Berlin.