Senator's bank comment sinks Wall Street
* Shares of Bank of America and Citigroup tumbled over 22 percent to session lows on the news.
* The Dow Jones industrial average slipped 180.80 points, or 2.42 percent, to 7,285.15. The Standard & Poor's 500 Index tumbled 20.26 points, or 2.60 percent, at 758.68. The Nasdaq Composite Index slid 18.75 points, or 1.30 percent, to 1,424.07.
(Reporting by Rodrigo Campos; Editing by Leslie Adler)