Citigroup says board member Robert Rubin, the former U.S. Treasury secretary, has resigned as a senior adviser to the big financial services company.
The bank says Rubin will continue to serve as a director until his term expires at the next annual meeting in the spring.
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He has drawn criticism for his role in the bank's recent problems that drove it to seek federal assistance.
Rubin was a senior counselor at Citigroup , and chairman of the bank for about a month after it ousted former chairman and CEO Charles Prince in November 2007. Win Bischoff became Citi's chairman in December 2007.
Rubin was U.S. Treasury Secretary under President Bill Clinton. For several decades prior to that, he worked at the Wall Street firm Goldman Sachs .