Copies of a dossier containing details of alleged child abuse operating among MPs in the 1970s-80s were "without question" circulated widely around Westminster, according to a Labour MP.
John Mann said there "was no question there were multiple copies" of the dossier, which is believed to have been destroyed, and "some people, who may still be working" will have seen it.
The Baroness says she did not consider the "difficulties" caused by her background and family connections to the child sex abuse inquiry.
Questions have been raised of former High Court judge Baroness Butler-Sloss since her appointment last week.
22 police officers are now assigned to Operation Fernbridge - the probe into claims of a Westminster cover-up of sex child abuse.