United Future Leader Peter Dunne hopes a new investigation will reveal whether his email records mistakenly sent to the Henry GCSB inquiry and temporarily accessible throughout the parliamentary complex were read by anyone not authorised to see them.
Mr Dunne resigned after refusing to release the full content of his emails to Fairfax reporter Andrea Vance in the days before her article revealing key points of the GCSB report including potentially illegal spying on New Zealanders by the agency.
A file containing the full emails between him and Ms Vance was mistakenly provided to the Henry Inquiry on May 21 but returned 45 minutes later. Inquiry boss David Henry has said the file was never opened.
However Mr Dunne also said the file had been on the Parliamentary Service server for five hours earlier that day.
"It is not clear whether the file was accessed during that time, and if so by whom."