The Prime Minister is promising findings from an inquiry into the SIS's release of information to blogger Cameron Slater will be made public.

The law governing the inquiry being run by the Inspector General of Intelligence and Security states it's findings can only be released with the consent of its minister - in this case John Key.

He says details will be forthcoming.

"Yes, I mean the only advice I would take for her if there was any particularly sensitive information that she needed to redact - I can't see why it would be the case it would be redacted.

"But outside that yes, it's got to be in the public domain."