Jami-Lee Ross is not resigning from Parliament and will remain on as an MP.

Ross said he was resigning as a National Party MP on Tuesday, but technically remained in Parliament as an MP, promising to properly resign on Friday.

But he has told Newstalk ZB he would not be leaving, as the National Party had "changed the rules on him" so he did not believe he could properly fight a byelection.

As of 5pm Friday Speaker Trevor Mallard had not received a letter of resignation from Ross, which would spark the by-election replace him.

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Parliamentary privilege would mean anything Ross said in the House would not be covered by defamation laws.

The last MP to quit the National Party and win the resulting by-election as an independent was Winston Peters in 1993.

It's been a tumultuous week for the 32-year-old, and his former boss National Party leader Simon Bridges.

The pair had a spectacular falling out this week starting with Ross' bombshell claims of corruption around party donors. Bridges hit back by expelling Ross from the caucus after a PwC inquiry suggested that Ross had earlier in the year leaked information about Bridges' travel expenses.

Ross denies he was the leaker, while Bridges also denies the claims Ross has made about the donation.

Ross released audio from earlier in the year of a taped phone conversation with Bridges, where the leader called one of his own MPs, Maureen Pugh, "f..... useless". Bridges apologised to Pugh on Wednesday for the remark, while Ross on Thursday released a text message exchange with National Party general manager Greg Hamilton.

More bombshell claims were dropped in a Newsroom story on Thursday that spoke to four women who say they were poorly treated by Ross. Ross is considering his legal options in response to the story.

More to come.