Two women who have accused Bill Cosby of sexually assaulting them decades ago have joined a defamation lawsuit filed by another accuser, claiming that the comedian “publicly branded” them liars through his representatives while denying their allegations. The amended complaint was reportedly filed Monday in U.S. District Court in Springfield, Massachusetts.

The two new plaintiffs -- Therese Serignese and Linda Traitz -- joined Tamara Green’s lawsuit, which was filed on Dec. 10, stating that the 77-year-old actor was the only defendant in the lawsuit as he is liable for the conduct of his legal and press teams.

"The lawsuit provides an opportunity for women who claim to have been harmed to have their day in court in a forum where the truth can be tried," Joseph Cammarata, the attorney representing the three women said, according to The Associated Press.

Serignese had previously claimed that she was drugged and raped by Cosby in 1976, while Traitz alleged that the actor tried to drug her and sexually assault her in 1970.

The two Florida women alleged in the lawsuit that they came forward about the sexual assaults last November when Cosby’s lawyer Martin Singer issued statements accusing them of creating “fabricated stories.”

At least 15 women have spoken out since November alleging that they were either sexually assaulted or raped by Cosby. Green first spoke about the alleged sexual assault in 2005 when she was named in a lawsuit filed by another accuser, Andrea Constand. The case was later settled out of court in 2006.

"We are very confident that we will prevail in this proceeding and we will pursue claims against the attorneys who filed this action," Singer, told People magazine following Green's filing.