Bill Cosby's lawyers have filed a motion to block a subpoena for material connected to the 2006 sexual assault lawsuit against the comedian, The Associated Press reports.

Tamara Green, Therese Seignese and Linda Traitz, all of whom say Cosby assaulted them in the 1970s, are now suing the actor for defamation after his agents and lawyers branded them liars. A lawyer for the three women sent a subpoena to a lawyer for the 2006 Philadelphia accuser Andrea Constrand with the intention that documents from Constrand's lawsuit would help the new defamation suit.

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However, Constrand and Cosby settled the case, and it is now protected by a confidentiality agreement. Cosby's lawyers contend that such agreements "should not be set aside lightly."

Cosby continues to deny all allegations against him, despite the fact that his accusers now number in the dozens.