Opposition parties have used information dumped by the Government last week to attack the Prime Minister's credibility over his handling of the inquiry into the leak of a spy agency report.
During Question Time on Tuesday, they asked John Key whether he stood by earlier comments that the inquiry into the Government Communications Security Bureau had not asked for the phone and email records of a Fairfax reporter when the information released on Friday revealed it did.
Mr Key disputes whether the emails his office released on Friday confirm that the inquiry did seek reporter Andrea Vance's records.
The Prime Minister faced questioning from Labour leader David Shearer and the Green Party's co-leader Russel Norman on the matter.
Labour's deputy leader Grant Robertson sought leave to table an email from the inquiry asking Parliamentary Service to provide phone records between Ms Vance and independent MP Peter Dunne.
Mr Robertson said it showed that Mr Key was lying to Parliament.
New Zealand First leader Winston Peters agreed.
"Mr Robertson concluded his last submission to the House about the Prime Minister lying. Now, that usually is found to be an offence in this House by all members including the person who is the subject of the allegation. Of course, it doesn't happen when it's true."