Just released police files are casting doubt on whether John Banks was up front with the public about his dealings with businessman Kim Dotcom.
Earlier this year, when the ACT MP was facing questions about cash donations made by Mr Dotcom to his 2010 Mayoralty campaign, Mr Banks said he couldn't remember meeting him.
However an affidavit given by Mr Dotcom's lawyer, Gregory Towers, to the police investigation into Mr Banks donation returns, says Mr Banks spoke to him in February this year about his client.
Mr Towers' statement says that as much as Mr Banks wanted to publicly support Mr Dotcom, it might backfire if his election support for him became known.
Labour's taken the opportunity to put pressure on Mr Key and Mr Banks.
David Shearer says the affidavits add to the evidence that Mr Banks wasn't up front about his dealings with Dotcom.
"Mr Key should have a good look at this information and realise that actually, his ethical standards, which he said he was going to uphold as a Prime Minister, are in tatters."
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