'I've done nothing wrong' - Banks

John Banks is unapologetic for going to bat for Kim Dotcom.

The ACT leader is under renewed attack from opposition MPs after it emerged he lobbied the government over an application Dotcom made to the Overseas Investment Office.

Mr Banks says there's absolutely nothing wrong with what he did.

"I wasn't the mayor of Auckland, I wasn't a member of parliament. I was a private citizen, I made the phone call, and I'd do it again."

The ACT leader says the only reason he avoided questions about donations from Kim Dotcom late last week is because of legal advice.

"I don't do things that are dishonest, I don't sign documents that are wrong. I'm a Justice of the Peace, I've been around politics 36 years, and I signed that document according to the legal advice that I had."

"I wasn't the mayor of Auckland, I wasn't a member of parliament. I was a private citizen, I made the phone call, and I'd do it again."

Mr Banks insists he's done nothing wrong and has absolutely nothing to hide.

"I hope the inquiry starts this afternoon and I certainly hope it's concluded by the end of this week so I welcome the inquiry, full disclosure, no problems with the inquiry and no problems giving absolutely straight answers."

Labour Leader David Shearer says John Key has to act.

"For how long is he prepared to allow John Banks to remain a minister while he is being investigated by the police for electoral fraud?"

Prime Minister John Key says he's standing by Mr Banks until he's proven wrong.

"He's not denying he's made a phone conversation, he's denying the details of that conversation. In the end if Mr Dotcom could prove that Mr Banks was not telling the truth, I think we all know what the consequences of that would be."

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