The author of the book Dirty Politics, Nicky Hager, says John Key and the National Party still have questions to answer despite a resounding election victory.
Dirty Politics claims National ministers and staff repeatedly smeared opponents by feeding damaging information to right-wing bloggers.
Nicky Hager's Dirty Politics claims that Tony Falkenstein, was the target of online attacks written by the blogger Cameron Slater. Photo: RNZ
That lead to the resignation of Judith Collins as a minister.
Listen to Nicky Hager
Mr Hager said he knew National was high in the polls and likely to win the election when he published the book.
But he said people will still be talking about the issues the book raises long after the election, because Mr Key still has not answered any of the questions it poses.