Chancellor Angela Merkel Chancellor Angela Merkel

German Chancellor and leader of the German Christian Democrats (CDU) Angela Merkel, stands with leading members of her party, as she speaks to the media after preliminary coalition talks collapsed on Sunday. Sean Gallup/Getty Images hide caption

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Sean Gallup/Getty Images

A police officer stands guard Wednesday near a Christmas market in Berlin where a truck plowed into a crowd Monday, killing 12 people. Sean Gallup/Getty Images hide caption

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Sean Gallup/Getty Images

German Chancellor Angela Merkel at a session of the Bundestag Lower House of Parliament in Berlin Wednesday. Germany's top federal prosecutor told legislators today that he is opening a formal inquiry into allegations that the NSA tapped her phone. John MacDougall/AFP/Getty Images hide caption

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John MacDougall/AFP/Getty Images

Victoria Nuland, the U.S. assistant secretary of state, lights a candle in St. Michael Cathedral in Kiev, Ukraine, on Thursday. Her comments during a leaked phone call have sparked a diplomatic row. AP hide caption

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AP

President Obama and Chancellor Angela Merkel during the official arrival ceremony for the German leader at the White House this morning (June 7, 2011). Jewel Samad /AFP/Getty Images hide caption

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Jewel Samad /AFP/Getty Images