German Chancellor Angela Merkel German Chancellor Angela Merkel

President Trump does the "ASEAN-way handshake" with Vietnamese Prime Minister Nguyen Xuan Phuc (left) and Philippines President Rodrigo Duterte on stage during the opening ceremony at the ASEAN Summit on Monday. Trump initially did the handshake incorrectly. Andrew Harnik/AP hide caption

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Andrew Harnik/AP

German Chancellor Helmut Kohl, shown in 1989, oversaw the reunification of his country after the fall of the Berlin Wall. ullstein bild via Getty Images hide caption

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ullstein bild via Getty Images

Remembering Helmut Schmidt

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First daughter and presidential adviser Ivanka Trump (second from left) arrives for a panel discussion with (from left) W20 co-Chairwoman Stephanie Bschorr, German Chancellor Angela Merkel and Queen Maxima of the Netherlands. John MacDougall/AFP/Getty Images hide caption

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John MacDougall/AFP/Getty Images

President Trump looks on as German Chancellor Angela Merkel addresses the media at a joint news conference Friday at the White House. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

German Chancellor Angela Merkel arrives at a news conference where she announced her plan to run for a fourth term next year. Merkel is the leader of the conservative German Christian Democrats party. Carsten Koall/Getty Images hide caption

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Carsten Koall/Getty Images

Ukrainian President Petro Poroshenko, left, German Chancellor Angela Merkel and U.S. Vice President Joe Biden, background right, arrive for a meeting in Munich, Germany on Saturday. Matthias Schrader/AP hide caption

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Matthias Schrader/AP

German Chancellor Angela Merkel, left, and Mayor of Berlin Klaus Wowereit, 3rd from left, place candles to commemorate the victims of the Wall at the Berlin Wall memorial site at Bernauer Strasse in Berlin, Germany, on Sunday. Markus Schreiber/AP hide caption

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Markus Schreiber/AP

News of U.S. surveillance in Europe has met with distrust and anger; officials are heading to Washington to discuss matters next week. Here, members of an artists' group paint a mural called "Surveillance of the Fittest" on a wall in Cologne, Germany, on Thursday. Frank Augstein/AP hide caption

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Frank Augstein/AP