The Prime Minister's office has said it has no factual basis for suggesting Edward Snowden documents which exposed GCSB secrets were "fabricated".
But it has also said some of those with access to the Snowden documents - apparently including journalist Glenn Greenwald - "have a track record of misrepresenting, misinterpreting and misunderstanding information".
The "fabrication" claim has been part of the Prime Minister's standard response to revelations of activities carried out by New Zealand's electronic eavesdropping agency.
Details of the GCSB's work have included spying on international diplomats in support of Trade Minister Tim Groser's bid to lead the World Trade Organisation, feeding information to Bangaladeshi security forces facing murder and torture allegations and sending "full take" communications data from the Pacific to the National Security Agency.
The stories - in a reporting partnership with journalist Nicky Hager and the Greenwald-founded news site The Intercept - showed New Zealand had a job-sharing role in international intelligence gathering for the Five Eyes group of nations, which also includes Australia, Canada, the United Kingdom and the US. The Five Eyes intelligence gathering group is led by the US, with the other countries holding "second party" status.