The law firm, San Francisco-based Morrison & Foerster, said it had retained outside attorneys to investigate the allegations against Fairfax.
Fairfax had agreed to cooperate with the investigation, the firm said.
“We take the allegations against Justin very seriously. As a firm, we believe that it is important to seriously listen to any allegation of sexual assault or harassment, and to treat all persons making such allegations with respect and sensitivity,” the chairman of the firm, Larren Nashelsky, said in a statement.
Fairfax, who has a law degree from Columbia, joined the firm in 2018. Prior to entering office, Fairfax had served as an assistant U.S. Attorney in the Eastern District of Virginia.
One woman, Stanford Professor Vanessa Tyson, said Fairfax had forced her to perform oral sex during the 2004 Democratic National Convention in Boston. A second woman, Meredith Watson, said Friday that Fairfax had raped her in 2000, when they both attended Duke University.
Fairfax has denied both allegations.
Democrats in Virginia, reeling from scandals enveloping Gov. Ralph Northam (D) and Attorney General Mark Herring (D) that were taking place at the same time the new allegations came out against Fairfax, had initially treaded lightly around Tyson’s allegations.