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BERLIN, GERMANY - MARCH 12: German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel (C), Acting Chairman of the German Social Democrats (SPD) Olaf Scholz (L) and Chairman of the Bavarian Christian Democrats (CSU) Horst Seehofer (R) arrive to speak to the media prior to this afternoon's signing of the coalition contract by the CDU, SPD and CSU on March 12, 2018 in Berlin, Germany. The German Christian Democrats (CDU), the German Social Democrats (SPD) and the Bavarian Christian Democrats (CSU) will sign the coalition contract that will create the next German government. The new government will be sworn in this coming Wednesday. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MARCH 12:  German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel (C), Acting Chairman of the German Social Democrats (SPD) Olaf Scholz (L) and Chairman of the Bavarian Christian Democrats (CSU) Horst Seehofer (R) arrive to speak to the media prior to this afternoon's signing of the coalition contract by the CDU, SPD and CSU on March 12, 2018 in Berlin, Germany. The German Christian Democrats (CDU), the German Social Democrats (SPD) and the Bavarian Christian Democrats (CSU) will sign the coalition contract that will create the next German government. The new government will be sworn in this coming Wednesday.  (Photo by Sean Gallup/Getty Images)

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BERLIN, GERMANY - MARCH 12: German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel holds the coalition contract between the three parties to create the next German government after the signing on March 12, 2018 in Berlin, Germany. Today's signing follow months of arduous negotiations following federal elections last September. Merkel is due to be elected as chancellor for her fourth term in a session of the Bundestag this coming Wednesday. (Photo by Carsten Koall/Getty Images)

BERLIN, GERMANY - MARCH 12: German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel holds the coalition contract between the three parties to create the next German government after the signing on March 12, 2018 in Berlin, Germany. Today's signing follow months of arduous negotiations following federal elections last September. Merkel is due to be elected as chancellor for her fourth term in a session of the Bundestag this coming Wednesday. (Photo by Carsten Koall/Getty Images)

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BERLIN, GERMANY - MARCH 12: German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel arrives with Acting Chairman of the German Social Democrats (SPD) Olaf Scholz and Chairman of the Bavarian Christian Democrats (CSU) Horst Seehofer (both not pictured) to speak to the media prior to this afternoon's signing of the coalition contract by the CDU, SPD and CSU on March 12, 2018 in Berlin, Germany. The German Christian Democrats (CDU), the German Social Democrats (SPD) and the Bavarian Christian Democrats (CSU) will sign the coalition contract that will create the next German government. The new government will be sworn in this coming Wednesday. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - MARCH 12:  German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel arrives with Acting Chairman of the German Social Democrats (SPD) Olaf Scholz and Chairman of the Bavarian Christian Democrats (CSU) Horst Seehofer (both not pictured) to speak to the media prior to this afternoon's signing of the coalition contract by the CDU, SPD and CSU on March 12, 2018 in Berlin, Germany. The German Christian Democrats (CDU), the German Social Democrats (SPD) and the Bavarian Christian Democrats (CSU) will sign the coalition contract that will create the next German government. The new government will be sworn in this coming Wednesday.  (Photo by Sean Gallup/Getty Images)

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BERLIN, GERMANY - MARCH 12: Christian Lindner of the German Free Democrats (FDP) political party speaks to the media prior to this afternoon's signing of the coalition contract by the CDU, SPD and CSU on March 12, 2018 in Berlin, Germany. The German Christian Democrats (CDU), the German Social Democrats (SPD) and the Bavarian Christian Democrats (CSU) will sign the coalition contract that will create the next German government. The new government will be sworn in this coming Wednesday. (Photo by Carsten Koall/Getty Images)

BERLIN, GERMANY - MARCH 12: Christian Lindner of the German Free Democrats (FDP) political party speaks to the media prior to this afternoon's signing of the coalition contract by the CDU, SPD and CSU on March 12, 2018 in Berlin, Germany. The German Christian Democrats (CDU), the German Social Democrats (SPD) and the Bavarian Christian Democrats (CSU) will sign the coalition contract that will create the next German government. The new government will be sworn in this coming Wednesday. (Photo by Carsten Koall/Getty Images)

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BERLIN, GERMANY - MARCH 12: SPD The General Secretary of the Social Democrats Lars Klingbeil, The Parliamentary group leader Social Democrats (SPD) Andrea Nahles , Acting Chairman of the German Social Democrats (SPD) Olaf Scholz (C-L) German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel (C), Chairman of the Bavarian Christian Democrats (CSU) Horst Seehofer (C-R) Parliamentasry group leader of the Christian democrats (CDU) Volker Kauder, and of the CSU Alexander Dobrind with general secretary of CDU Annegret Kramp-Karrenbauer and Secretary General of the CSU Andreas Scheuer, pose after signing the coalition contract between the three parties to create the next German government on March 12, 2018 in Berlin, Germany. Today's signing follow months of arduous negotiations following federal elections last September. Merkel is due to be elected as chancellor for her fourth term in a session of the Bundestag this coming Wednesday. (Photo by Michele Tantussi/Getty Images)

BERLIN, GERMANY - MARCH 12: SPD The General Secretary of the Social Democrats Lars Klingbeil, The Parliamentary group leader Social Democrats (SPD) Andrea Nahles ,  Acting Chairman of the German Social Democrats (SPD) Olaf Scholz (C-L) German Chancellor and Chairwoman of the German Christian Democrats (CDU) Angela Merkel (C), Chairman of the Bavarian Christian Democrats (CSU) Horst Seehofer (C-R) Parliamentasry group leader of the Christian democrats (CDU) Volker Kauder, and of the CSU Alexander Dobrind with general secretary of CDU Annegret Kramp-Karrenbauer and Secretary General of the CSU Andreas Scheuer, pose after signing the coalition contract between the three parties to create the next German government on March 12, 2018 in Berlin, Germany. Today's signing follow months of arduous negotiations following federal elections last September. Merkel is due to be elected as chancellor for her fourth term in a session of the Bundestag this coming Wednesday. (Photo by Michele Tantussi/Getty Images)