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BERLIN, GERMANY - MAY 25: (L-R) Chairman of the Council of the EKD and Bavarian regional Bishop Heinrich Bedford-Strohm, former President of the United States of America Barack Obama, German Chancellor Angela Merkel and president of Church Congress Christina Aus der Au arrive for a discussion on democracy at Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg which is celebrating the 500th anniversary of the Reformation. (Photo by Steffi Loos/Getty Images)

BERLIN, GERMANY - MAY 25: (L-R) Chairman of the Council of the EKD and Bavarian regional Bishop Heinrich Bedford-Strohm, former President of the United States of America Barack Obama, German Chancellor Angela Merkel and president of Church Congress Christina Aus der Au arrive for a discussion on democracy at Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg which is celebrating the 500th anniversary of the Reformation. (Photo by Steffi Loos/Getty Images)
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BERLIN, GERMANY - MAY 25: Former President of the United States of America, Barack Obama and German Chancellor Angela Merkel (CDU) walk on stage at the Brandenburg Gate during the nationwide Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg which is celebrating the 500th anniversary of the Reformation. (Photo by Alexander Koerner/Getty Images)

BERLIN, GERMANY - MAY 25: Former President of the United States of America, Barack Obama and German Chancellor Angela Merkel (CDU) walk on stage at the Brandenburg Gate during the nationwide Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg which is celebrating the 500th anniversary of the Reformation. (Photo by Alexander Koerner/Getty Images)
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BERLIN, GERMANY - MAY 25: German Chancellor Angela Merkel and former President of the United States of America Barack Obama discuss democracy at Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg that this year is celebrating the 500th anniversary of the Reformation. (Photo by Steffi Loos/Getty Images)

BERLIN, GERMANY - MAY 25: German Chancellor Angela Merkel and former President of the United States of America Barack Obama discuss democracy at Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg that this year is celebrating the 500th anniversary of the Reformation. (Photo by Steffi Loos/Getty Images)
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BERLIN, GERMANY - MAY 25: German Chancellor Angela Merkel and former President of the United States of America Barack Obama discuss democracy at Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg that this year is celebrating the 500th anniversary of the Reformation. (Photo by Steffi Loos/Getty Images)

BERLIN, GERMANY - MAY 25: German Chancellor Angela Merkel and former President of the United States of America Barack Obama discuss democracy at Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg that this year is celebrating the 500th anniversary of the Reformation. (Photo by Steffi Loos/Getty Images)
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BERLIN, GERMANY - MAY 25: Former President of the United States of America Barack Obama discusses democracy with German Chancellor Angela Merkel at Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg that this year is celebrating the 500th anniversary of the Reformation. (Photo by Steffi Loos/Getty Images)

BERLIN, GERMANY - MAY 25: Former President of the United States of America Barack Obama discusses democracy with German Chancellor Angela Merkel at Church Congress on May 25, 2017 in Berlin, Germany. Up to 200,000 faithful are expected to attend the five-day congress in Berlin and Wittenberg that this year is celebrating the 500th anniversary of the Reformation. (Photo by Steffi Loos/Getty Images)
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