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BERLIN, GERMANY - JUNE 19: In this handout photo provided by the German Government Press Office (BPA), U.S. President Barack Obama (L) and German Chancellor Angela Merkel chat prior to a lunch at the terrace of the Chancellery on June 19, 2013 in Berlin, Germany. Obama is visiting Berlin for the first time during his presidency and his speech at the Brandenburg Gate is to be the highlight. Obama will be speaking close to the 50th anniversary of the historic speech by then U.S. President John F. Kennedy in Berlin in 1963, during which he proclaimed the famous sentence: Ich bin ein Berliner.
BERLIN, GERMANY - JUNE 19: In this handout photo provided by the German Government Press Office (BPA), U.S. President Barack Obama (L) and German Chancellor Angela Merkel chat prior to a lunch at the terrace of the Chancellery on June 19, 2013 in Berlin, Germany. Obama is visiting Berlin for the first time during his presidency and his speech at the Brandenburg Gate is to be the highlight. Obama will be speaking close to the 50th anniversary of the historic speech by then U.S. President John F. Kennedy in Berlin in 1963, during which he proclaimed the famous sentence: Ich bin ein Berliner.

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Will spying row ruin US-German relations?

A spying spat once again threatens relations between Washington and its key ally in Berlin. CNN's Fred Pleitgen reports.

Will spying row ruin US-German relations?

A spying spat once again threatens relations between Washington and its key ally in Berlin. CNN's Fred Pleitgen reports.