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STUTTGART, GERMANY - JANUARY 06: Christian Lindner (L), head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) is seen with carollers dressed as the Three Kings during the traditional Epiphany meeting of the German Liberals at the opera on January 6, 2016 in Stuttgart, Germany. The Epiphany conference is the first party meeting of the FDP in the year. (Photo by Thomas Niedermueller/Getty Images)

STUTTGART, GERMANY - JANUARY 06:  Christian Lindner (L), head of the German Free Democratic Party (Freie Demokratische Partei, or FDP)  is seen with carollers dressed as the Three Kings during the traditional Epiphany meeting of the German Liberals at the opera on January 6, 2016 in Stuttgart, Germany. The Epiphany conference is the first party meeting of the FDP in the year.  (Photo by Thomas Niedermueller/Getty Images)

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STUTTGART, GERMANY - JANUARY 06: Christian Lindner, head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) talks during the traditional Epiphany meeting of the German Liberals at the opera on January 6, 2016 in Stuttgart, Germany. The Epiphany conference is the first party meeting of the FDP in the year. (Photo by Thomas Niedermueller/Getty Images)

STUTTGART, GERMANY - JANUARY 06:  Christian Lindner, head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) talks during the traditional Epiphany meeting of the German Liberals at the opera on January 6, 2016 in Stuttgart, Germany. The Epiphany conference is the first party meeting of the FDP in the year.  (Photo by Thomas Niedermueller/Getty Images)

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STUTTGART, GERMANY - JANUARY 06: Christian Lindner (C), head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) is seen with carollers dressed as the Three Kings during during the traditional Epiphany meeting of the German Free Democratic Party (Freie Demokratische Partei, or FDP) at the opera on January 6, 2017 in Stuttgart, Germany. The Epiphany conference is the first party meeting of the FDP in the year. (Photo by Thomas Niedermueller/Getty Images)

STUTTGART, GERMANY - JANUARY 06:  Christian Lindner (C), head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) is seen with carollers dressed as the Three Kings during during the traditional Epiphany meeting of the German Free Democratic Party (Freie Demokratische Partei, or FDP) at the opera on January 6, 2017 in Stuttgart, Germany.  The Epiphany conference is the first party meeting of the FDP in the year.  (Photo by Thomas Niedermueller/Getty Images)

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STUTTGART, GERMANY - JANUARY 06: Christian Lindner, head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) is seen during the traditional Epiphany meeting of the German Free Democratic Party (Freie Demokratische Partei, or FDP) at the opera on January 6, 2018 in Stuttgart, Germany. The Epiphany conference is the first party meeting of the FDP in the year. (Photo by Thomas Niedermueller/Getty Images)

STUTTGART, GERMANY - JANUARY 06:  Christian Lindner, head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) is seen during the traditional Epiphany meeting of the German Free Democratic Party (Freie Demokratische Partei, or FDP) at the opera on January 6, 2018 in Stuttgart, Germany. The Epiphany conference is the first party meeting of the FDP in the year.  (Photo by Thomas Niedermueller/Getty Images)

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STUTTGART, GERMANY - JANUARY 06: Christian Lindner, head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) talks during the traditional Epiphany meeting of the German Free Democratic Party (Freie Demokratische Partei, or FDP) at the opera on January 6, 2017 in Stuttgart, Germany. The Epiphany conference is the first party meeting of the FDP in the year. (Photo by Thomas Niedermueller/Getty Images)

STUTTGART, GERMANY - JANUARY 06: Christian Lindner, head of the German Free Democratic Party (Freie Demokratische Partei, or FDP) talks during the traditional Epiphany meeting of the German Free Democratic Party (Freie Demokratische Partei, or FDP) at the opera on January 6, 2017 in Stuttgart, Germany.  The Epiphany conference is the first party meeting of the FDP in the year.  (Photo by Thomas Niedermueller/Getty Images)