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The University of Oklahoma is paying one of the largest law firms in the world to investigate former President David Boren, sources have confirmed.

Investigators with the Jones Day law firm have asked whether Boren sexually harassed male aides, sources said.

Boren, a former Oklahoma governor and U.S. senator, retired last year after nearly 24 years in charge at OU. Through an attorney Wednesday, Boren, 77, denied any misconduct.

"This is not an objective search for the truth. It is a fishing expedition," attorney Bob Burke told The Oklahoman. "President Boren emphatically denies any inappropriate behavior or unlawful activity. He has been a dedicated public servant for more than 50 years and his life is an open book in Oklahoma."