RiskMetrics Group has advised its clients to call for the ouster of US Chamber of Commerce chief Tom Donohue from the board of Sunrise Senior Living Inc., due to accounting irregularities at the company, Bloomberg reports.

RiskMetrics advises mutual funds and pension funds on proxy votes. The group "believes that the chronic and serious nature of the accounting issues, potential stock option misdating, and potential insider trading is indicative of a significant lack of oversight on the part of the board," the New York-based firm said in a November 6 report.