U.S. Treasury Secretary Janet Yellen stated that Deutsche Bank CEO Christian Sewing called to refute a report by one of the bank's analysts suggesting that European investors might sell off U.S. assets. "The idea that European investors will sell U.S. assets comes solely from a Deutsche Bank analyst," Yellen said at the World Economic Forum in Davos on Wednesday. "Deutsche Bank's CEO called to say that Deutsche Bank does not agree with that analyst report." George Saravelos, Head of Global Foreign Exchange Research at Deutsche Bank, wrote in a client report on Sunday that U.S. President Trump issued tariff threats to several European governments over Greenland, raising the possibility of Europe reducing its holdings of U.S. assets.