Act MP John Banks is being accused of not following the rules in his 2010 bid to win the Auckland Super City mayoralty.
Labour MP Grant Robertson used the protection of Parliamentary privilege to accuse Mr Banks of not declaring a $15,000 donation he received from SkyCity Casino towards his mayoral campaign.
He said SkyCity has said it gave $15,000 to both main candidates in the 2010 election and has a policy of asking candidates to declare such donations.
Mr Robertson said Mr Banks did not declare receiving such an amount in his election returns.
