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(L-R) German Chancellor Angela Merkel, National Security Advisor Thomas Donilon, US President Barack Obama and United States Ambassador to Germany Philip Murphy meet for a bilateral meetingfor a bilateral meeting at the chancellery in Berlin on June 19, 2013. On the second day of his visit to Germany Obama met with German President Joachim Gauck and Chancellor Merkel before delivering a speech at Brandenburg Gate. AFP PHOTO / GERO BRELOER /POOL (Photo credit should read GERO BRELOER/AFP/Getty Images)

(L-R) German Chancellor Angela Merkel, National Security Advisor Thomas Donilon, US President Barack Obama and United States Ambassador to Germany Philip Murphy meet for a bilateral meetingfor a bilateral meeting at the chancellery in Berlin on June 19, 2013. On the second day of his visit to Germany Obama met with German President Joachim Gauck and Chancellor Merkel before delivering a speech at Brandenburg Gate.   AFP PHOTO / GERO BRELOER /POOL        (Photo credit should read GERO BRELOER/AFP/Getty Images)