Internet tycoon Kim Dotcom's records will show ACT MP John Banks made a phone call to say thanks for two $25,000 donations, it's been reported.
Labour wants an inquiry into the donations Mr Banks received during his failed campaign to become Auckland mayor in 2010, claiming they were listed in election returns as anonymous when the MP must have known where they came from.
Mr Banks says he's done nothing wrong, didn't know Dotcom made the donations and didn't phone him to thank him for them.
3News reports Mr Banks met Dotcom in June 2010 and a few days later two $25,000 cheques were banked in Queenstown into Mr Banks' mayoral fund.
They were made out to Team Banks.
"Our source says Banks rang Dotcom two days later. The source says `Kim's records will show this'," 3News reports.
The call to say "thank you" is crucial to Labour's case because it would prove Mr Banks knew where the donations came from.
Labour says Mr Banks breached electoral law by listing the donations as anonymous when he knew who the donor was.
Mr Banks won't answer questions other than to say he didn't call Dotcom about the donations.
"I am 100 per cent confident that the investigation will conclude in my favour," he said on Monday.
Opposition parties say Mr Banks should be stood down from his ministerial portfolios while this investigation - and another into a donation from Sky City - are carried out.
Prime Minister John Key says he won't do that because Mr Banks has given him an assurance he complied with the law.