The Cosby Show star is facing sexual assault accusations from dozens of females, seven of whom have filed a defamation lawsuit against the actor after they were branded liars for going public with their claims.

Camille Cosby has stood by her husband of almost 52 years, but she has now been dragged into the legal dispute and has been ordered to answer questions under oath on 6 January (16) in Springfield, Massachusetts, where the lawsuit was filed.

On Friday (18Dec15), Cosby's lawyers moved to block the deposition, insisting she has no knowledge of the alleged incidents, while arguing the couple's confidential conversations are protected by the Massachusetts spousal disqualification rule.

However, the accusers' lawyer Joseph Cammarata is fighting back, stating Camille should be deposed because she served as her husband's business manager.

"I think she has information that's relevant to the litigation in this matter," Cammarata challenges.

Cosby's lawyers believe the deposition is "nothing more than a thinly veiled attempt to pressure defendant in the face of subjecting his wife to the shame and embarrassment of responding to questions about his alleged infidelities and sexual misconduct".

Cosby has denied all accusations of inappropriate behaviour, sexual assault and/or rape, which date back decades.

He launched a countersuit against plaintiffs Tamara Green, Therese Serignese, Linda Traitz, Louisa Moritz, Barbara Bowman, Joan Tarshis and Angela Leslie earlier this month (20Dec15) for making "malicious, opportunistic and false and defamatory accusations of sexual misconduct against him".