John Key has said he is aware of "some" but not all of the tools used by the GCSB amid fresh questions over an intrusive piece of spyware showcased by the United States' NSA to their Kiwi partners.
The Prime Minister stuck to his position in refusing to talk about "operational" details of the GCSB's work.
The refusal came the day after leaked material emerged from whistleblower Edward Snowden showing New Zealand was enmeshed in some of the most controversial aspects of the United States' spy machine.
Among those was a slide shown at a conference for the Five Eyes group of Australia, Canada, New Zealand, the United Kingdom and the United States which showcased the capabilities of the X-Keyscore tool, which the NSA uses to search mass-harvested phone and email records.
Asked if he knew the tools used by the GCSB, he said "some of them". "I don't go into the techniques the GCSB or SIS use."