Nicky Wagner has admitted to calling Deborah Russell a "bitch" in Parliament.

National's Nicky Wagner called Labour MP Deborah Russell "a bitch" in the heat of a Parliamentary debate last month.

Wagner was immediately asked to withdraw and apologise, which she did.

Russell was speaking during a June 20 debate about the Budget, saying she "hoped" that National's Amy Adams knew how to manage numbers.

MAHVASH ALI/STUFF Labour MP Deborah Russell heard the "unparliamentary word".

Wagner interjected to simply say "you are a bitch".

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Russell immediately stopped her speech to say she had heard an "unparliamentary word" and identified Wagner.

A Hansard transcript - which is no longer a draft - of the moment.

Wagner withdrew and apologised for the statement.

The comment is barely audible in video from the Chamber but made it into the draft version of Hansard, the official record of Parliamentary debates.

Hansard staff do not take down every interjection but do note them if the MP who has the call responds to them.

The statement was then removed from Hansard, but not at the behest of Wagner or her office, as some assumed.

A spokeswoman for Hansard said a "junior staffer" had removed the reference and should not have. It was replaced in Hansard on Tuesday.

Russell said on Twitter she was "astounded" it had been edited out.

Wagner told Stuff she shouldn't have used the word. "I did use the word. I shouldn't have and I apologised immediately. I did not ask to have the transcript edited," Wagner said.

Russell told Stuff that she believed the issue was done and dusted and "what happens in the House stays in the House."

"To be fair to Nicky I was having quite a crack at Amy Adams," Russell said.

When the incident happened Russell was "sufficiently gobsmacked."

"I didn't even want to repeat the word."

But she didn't expect Wagner to apologise further outside of the House.

This is not the first time Wagner has gotten into hot water for off-the-cuff remarks.

In June of 2017 Wagner, then Disability Issues Minister, said she would rather be out on Auckland Harbour than in disability meetings.