A section of the police file obtained by the Herald stated "there is the matter of Winston Peters quoting from the recorded conversation''.
"There is no doubt he quoted from in albeit very short pieces.
"If the decision is made that Ambrose has committed the offence of unlawfully recording a private conversation then Peters (would) be investigated for disclosing the same.''
Mr Peters, who claimed police sought his phone records, said the Prime Minister's decision not to lay charges had to be considered in light of the police position that it would trigger a criminal investigation against the NZ First leader. He said the scandal would have "exploded into another dimension'' if it had led to a political party leader being prosecuted as a result of a complaint by the Prime Minister during an election.
"It wouldn't just be buying a fight with me, it would be buying a fight with the whole political system.''
The documents seen by the Herald also confirm Mr Eagleson was regularly informed by police. One reference said he would be told the file was being sent from Wellington to Auckland, showing the level of detail on which he was being briefed.
Mr Peters said the frequency of contact was an issue, with the PM's office being briefed more regularly than criminal complainants would normally expect.
He said the investigation should never have taken place. "I thought Ambrose was totally innocent,'' he said. The confusion over the microphone reflected "one man trying to do three jobs'' in an under-funded media. He said he wanted the entire police file released.