A leaked letter reportedly reveals that Prime Minister John Key lent his support to a multimillion-dollar private insurance claim by the woman at the centre of the ACC privacy breach.
Mr Key denies that, saying he was never part of a support and advisory team to help National Party insider Bronwyn Pullar in her attempt to claim up to $14 million.
The letter from private insurer Sovereign, leaked to TVNZ's Close Up programme, claims Mr Key was among 28 high-profile people who backed Ms Pullar in her claim.
Ms Pullar's fight for compensation over a 2002 cycling injury has already caused headaches for the National Party, drawing in former president Michelle Boag and leading to the resignation of senior minister Nick Smith.
Ms Boag acted as a support person at a meeting with senior ACC managers in which Ms Pullar allegedly threatened to go public with information she accidentally received about 6700 ACC claims.