The rowdy special session -- which was followed by a general debate on public confidence in media and the police -- came hours after Parliament's Home Affairs committee issued a scathing report about the scandal.
Legislators said in the report that they "deplored" obstruction by News International when lawmakers first tried to probe accusations of illegal eavesdropping by journalists working for Murdoch. The report also criticized police for failing to investigate the case properly.
News International said in a statement late Wednesday that the law firm Harbottle and Lewis had been authorized to answer questions from the police and parliamentary committees.
Earlier, John Whittingdale, chairman of Parliament's Culture, Media and Sport Select Committee, told lawmakers that News International had refused to release the law firm -- which holds papers related to the phone-hacking claims -- from its duty of client confidentiality.
Questioned about his ties to those involved in the scandal, Cameron denied having had "inappropriate conversations" about Murdoch's efforts to take full ownership of British satellite broadcaster BSkyB in meetings with executives of News Corp.
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