John Key says a report investigating who leaked the so-called Kitteridge report to the media will be made public.
The report detailed 88 cases of possible illegal spying by the GCSB.
Winston Peters has accused Peter Dunne under the protection of parliamentary privilege of leaking it.
Mr Key says he takes Mr Dunne at his word, and while the investigation will be released, he does not have any more information.
"In the end I commissioned the report, essentially it goes to these two organisations so they're at the forefront of it.