Beijing, China. 4th Sep, 2017. Yan Junqi (2nd R), vice chairwoman of the Standing Committee of China's National People's Congress, meets with Kurt Beck, former chairman of Germany's Social Democratic Party and also chairman of Friedrich-Ebert-Stiftung (FES), at the Great Hall of the People in Beijing, capital of China, Sept. 4, 2017. Credit: Ding Haitao/Xinhua/Alamy Live News
RMK44C6EBeijing, China. 4th Sep, 2017. Yan Junqi (2nd R), vice chairwoman of the Standing Committee of China's National People's Congress, meets with Kurt Beck, former chairman of Germany's Social Democratic Party and also chairman of Friedrich-Ebert-Stiftung (FES), at the Great Hall of the People in Beijing, capital of China, Sept. 4, 2017. Credit: Ding Haitao/Xinhua/Alamy Live News
The chairman of Germany's Social Democratic Party (SPD) Sigmar Gabriel (R) gives an interview at his party's first convention in 2012 at Inselhotel in Potsdam, Germany, 29 January 2012. Photo: Bernd Settnik
RMD6EEWAThe chairman of Germany's Social Democratic Party (SPD) Sigmar Gabriel (R) gives an interview at his party's first convention in 2012 at Inselhotel in Potsdam, Germany, 29 January 2012. Photo: Bernd Settnik
Berlin, Germany. 27th Nov, 2013. Sigmar Gabriel, Chairman of the Social Democratic Party (SPD) attends a press conference in Berlin, Germany, on Nov. 27, 2013. Leaders from Germany's main parties signed provisionally a coalition agreement on Wednesday, paving the road for forming a new government two months after a federal election. Credit:  Zhang Fan/Xinhua/Alamy Live News
RMDJE4H6Berlin, Germany. 27th Nov, 2013. Sigmar Gabriel, Chairman of the Social Democratic Party (SPD) attends a press conference in Berlin, Germany, on Nov. 27, 2013. Leaders from Germany's main parties signed provisionally a coalition agreement on Wednesday, paving the road for forming a new government two months after a federal election. Credit: Zhang Fan/Xinhua/Alamy Live News
Berlin, Germany. 26th Mar, 2017. Martin Schulz, chairman and chancellor candidate of Germany's Social Democratic Party (SPD), delivers remarks after the Saarland state elections, in Berlin, Germany, 26 March 2017. Photo: Kay Nietfeld/dpa/Alamy Live News
RMHX9XGTBerlin, Germany. 26th Mar, 2017. Martin Schulz, chairman and chancellor candidate of Germany's Social Democratic Party (SPD), delivers remarks after the Saarland state elections, in Berlin, Germany, 26 March 2017. Photo: Kay Nietfeld/dpa/Alamy Live News
German Foreign Minister Frank-Walter Steinmeier sits alone during a one-day party congress of Germany's Social Democratic party SPD in Berlin October 18, 2008. Germany's Social Democrats will elect a new chairman and crown Steinmeier as their candidate for chancellor on Saturday, hoping a leadership change can revive their fortunes and topple Angela Merkel in a 2009 election.   REUTERS/Wolfgang Rattay    (GERMANY)
RM2E6Y77PGerman Foreign Minister Frank-Walter Steinmeier sits alone during a one-day party congress of Germany's Social Democratic party SPD in Berlin October 18, 2008. Germany's Social Democrats will elect a new chairman and crown Steinmeier as their candidate for chancellor on Saturday, hoping a leadership change can revive their fortunes and topple Angela Merkel in a 2009 election. REUTERS/Wolfgang Rattay (GERMANY)
The chairman of Germany's Social Democratic Party (SPD) Sigmar Gabriel attends the first SPD convention of 2012 at Inselhotel in Potsdam, Germany, 29 January 2012. Photo: BERND SETTNIK
RMD6EEWHThe chairman of Germany's Social Democratic Party (SPD) Sigmar Gabriel attends the first SPD convention of 2012 at Inselhotel in Potsdam, Germany, 29 January 2012. Photo: BERND SETTNIK
Berlin, Germany. 27th Nov, 2013. Sigmar Gabriel (L), Chairman of the Social Democratic Party (SPD) and German Chancellor Angela Merkel attend a press conference in Berlin, Germany, on Nov. 27, 2013. Leaders from Germany's main parties signed provisionally a coalition agreement on Wednesday, paving the road for forming a new government two months after a federal election. Credit:  Zhang Fan/Xinhua/Alamy Live News
RMDJE37XBerlin, Germany. 27th Nov, 2013. Sigmar Gabriel (L), Chairman of the Social Democratic Party (SPD) and German Chancellor Angela Merkel attend a press conference in Berlin, Germany, on Nov. 27, 2013. Leaders from Germany's main parties signed provisionally a coalition agreement on Wednesday, paving the road for forming a new government two months after a federal election. Credit: Zhang Fan/Xinhua/Alamy Live News
Berlin, Germany. 26th Mar, 2017. Martin Schulz, chairman and chancellor candidate of Germany's Social Democratic Party (SPD), delivers remarks after the Saarland state elections, in Berlin, Germany, 26 March 2017. Photo: Kay Nietfeld/dpa/Alamy Live News
RMHX9XH5Berlin, Germany. 26th Mar, 2017. Martin Schulz, chairman and chancellor candidate of Germany's Social Democratic Party (SPD), delivers remarks after the Saarland state elections, in Berlin, Germany, 26 March 2017. Photo: Kay Nietfeld/dpa/Alamy Live News
Newly elected SPD chairman Franz Muentefering (L) and German Foreign Minister Frank-Walter Steinmeier, SPD candidate for chancellor, sing at a Germany's Social Democratic party SPD convention in Berlin, October 18, 2008.     REUTERS/Tobias Schwarz     (GERMANY)
RM2E7AGCENewly elected SPD chairman Franz Muentefering (L) and German Foreign Minister Frank-Walter Steinmeier, SPD candidate for chancellor, sing at a Germany's Social Democratic party SPD convention in Berlin, October 18, 2008. REUTERS/Tobias Schwarz (GERMANY)
The chairman of Germany's Social Democratic Party (SPD) Sigmar Gabriel spekas with Hannelore Kraft, Minister-President of the German federal state of North Rhine-Westphalia, at the first SPD convention of 2012 at Inselhotel in Potsdam, Germany, 29 January 2012. Photo: BERND SETTNIK
RMD6EEX6The chairman of Germany's Social Democratic Party (SPD) Sigmar Gabriel spekas with Hannelore Kraft, Minister-President of the German federal state of North Rhine-Westphalia, at the first SPD convention of 2012 at Inselhotel in Potsdam, Germany, 29 January 2012. Photo: BERND SETTNIK
Franz Muentefering, designated chairman of Germany's Social Democratic party (SPD), addresses a news conference in Berlin, October 8, 2008.     REUTERS/Tobias Schwarz     (GERMANY)
RM2D1Y86MFranz Muentefering, designated chairman of Germany's Social Democratic party (SPD), addresses a news conference in Berlin, October 8, 2008. REUTERS/Tobias Schwarz (GERMANY)
Berlin, Germany. 27th Nov, 2013. Sigmar Gabriel (L), Chairman of the Social Democratic Party (SPD) and German Chancellor Angela Merkel attend a press conference in Berlin, Germany, on Nov. 27, 2013. Leaders from Germany's main parties signed provisionally a coalition agreement on Wednesday, paving the road for forming a new government two months after a federal election. Credit:  Zhang Fan/Xinhua/Alamy Live News
RMDJE4G7Berlin, Germany. 27th Nov, 2013. Sigmar Gabriel (L), Chairman of the Social Democratic Party (SPD) and German Chancellor Angela Merkel attend a press conference in Berlin, Germany, on Nov. 27, 2013. Leaders from Germany's main parties signed provisionally a coalition agreement on Wednesday, paving the road for forming a new government two months after a federal election. Credit: Zhang Fan/Xinhua/Alamy Live News