Former Treasury Secretary Robert Rubin pauses during an address to the American Society of Newspaper Editors April 23, 2004 in a Washington file photo. Citigroup Inc. Chairman and Chief Executive Charles Prince, beset by the banking company's billions of dollars in losses from investing in bad debt, reportedly agreed to resign Sunday Nov. 4, 2007, and was being replaced as chairman by former Treasury Secretary Robert Rubin. AP Photo logo AP Photo 95 months ago

Former Treasury Secretary Robert Rubin pauses during an address to the American Society of Newspaper Editors April 23, 2004 in a Washington file photo. Citigroup Inc. Chairman and Chief Executive Charles Prince, beset by the banking company's billions of dollars in losses from investing in bad debt, reportedly agreed to resign Sunday Nov. 4, 2007, and was being replaced as chairman by former Treasury Secretary Robert Rubin.