Protest marches against GCSB 'spy agency' bill across NZ

Prime Minister John Key told reporters on his visit to South Korea that it was important to understand what was actually in the GCSB legislation.

He said the bill would give greater oversight and was "a strengthening of the previous legislation''.

"I accept there are some that will always feel a bit nervous about privacy and their own rights, but I can give you the best assurance I can that we're very careful and cautious about what we do as a state. But in the end we do have to protect the interests in New Zealanders.''