Helen Clark and John Key are refusing to share the stage with other party leaders during the election campaign.
The two have jointly agreed not to appear on TV3 and TVNZ with all the other party leaders.
During the last election, TV3 tried to keep Jim Anderton and Peter Dunne out of the debate. However they complained and the High Court ruled that they must be included.
Miss Clark and Mr Key will appear in two separate head to head debates and TV3 and TVNZ have jointly written to the two leaders asking them to reconsider on the MMP debate, however they have declined.
It is understood that Miss Clark's office went to Mr Key with the idea to stay out of the debate, however Mr Key is refusing to point the finger.
Other minor parties are furious, with Act leader Rodney Hide describing it as pathetic and contemptuous.
3 News