The Electoral Commission is considering a complaint about Billy Te Kahika's NZ Public Party and its collection and use of donations.
A spokesperson for the commission said the Serious Fraud Office passed on the complaint.
The Electoral Commission can look into a complaint, but will pass it to the police if they believe there is any wrongdoing.
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Te Kahika's party has formed an alliance with former National MP Jami-Lee Ross' Advance New Zealand Party.