John Key helped the Maori Party throw a $5000-a-seat fundraiser at which diners at the event were promised the chance to "chat confidentially" with the Prime Minister.
The invitation for the event at Auckland's exclusive and private Northern Club told "15 specially selected leaders" that "John Key will change seats so that you will be on either side of him or directly opposite for ease of conversation".
The Maori Party's two ministers, Tariana Turia and Dr Pita Sharples, were also present at the April 2 four-course dinner, as was co-leader Te Ururoa Flavell.
Attending the event cost a minimum of $5000-a-head and has been described as inviting accusations of "selling access" to the Prime Minister. Maori Television's Native Affairs discovered the meeting and is screening footage of guests arriving on its show this evening.
Mr Key's office is defending it. A spokeswoman said: "The Prime Minister has attended a number of functions for the Maori Party and the other parties we have relationships with. It doesn't signify any deal, it simply illustrates a good relationship with parties we work with."