FRANKFURT, Germany — Federal Reserve Bank of San Francisco president John Williams has expressed strong concern about a renewed worsening of the European debt crisis in the period ahead, while expressing gauged optimism about the outlook for the U.S. economy, according to an interview with German financial daily Handelsblatt published Monday.

Williams said there is no need for additional monetary policy stimulus from the Federal Reserve at this time, though he left open the possibility of further measures in future if unemployment unexpectedly worsened. Williams indicated increasing discomfort at the U.S. central bank with the outlook for Europe.

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