Speaking in a CNBC interview, Gundlach, chief executive officer of DoubleLine Capital and known on Wall Street as the Bond King, also said that the Federal Reserve should not raise interest rates. His comments pushed US stocks to session lows.
The S&P 500 Financial sector index gave up its earlier intraday gains after Gundlach's comments and was last down 0.8 percent, though it still had the lowest percentage decline among the S&P 500's major sectors.
A profit warning from British retailer ASOS raised concerns about weakening consumer strength despite robust US retail sales data last week. The S&P 500 Retailing Index fell 3.2 percent, and shares of Amazon.com Inc dropped 4.1 percent. Amazon was the biggest drag on the Nasdaq and the second-biggest drag on the S&P 500.