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German Chancellor Angela Merkel issued a call for European unity in a speech at a joint campaigning event of the Christian Democratic Union and the Christian Social Union in Munich, southern Germany, on Sunday. Mattias Balk/AFP/Getty Images hide caption

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Mattias Balk/AFP/Getty Images

(From left) Canadian Prime Minister Justin Trudeau, German Chancellor Angela Merkel, U.S. President Trump, Italian Prime Minister Paolo Gentiloni, French President Emmanuel Macron, Japan's Prime Minister Shinzo Abe and British Prime Minister Theresa May pose during the G-7 summit in Taormina, Italy, on Friday. Andrew Medichini/AP hide caption

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Andrew Medichini/AP