BERLIN — Germany took the dramatic step Thursday of asking the top U.S. intelligence official in Berlin to leave the country, following two suspected cases of American spying and the yearlong spat over eavesdropping by the National Security Agency. The move reflects growing impatience in Germany at what is perceived as U.S. nonchalance about being caught spying on a close ally. "The representative of the U.S. intelligence services at the United States embassy has been asked to leave Germany," government spokesman Steffen Seibert said in a statement.