Prime Minister John Key and the Maori Party co-leaders are expected to meet this week to discuss Mr Key's comments about the Waitangi Tribunal - and members of the Iwi Leaders' Forum are also turning on Mr Key over the issue.
Forum member and Te Rarawa chairman Haami Piripi, who appeared before the Waitangi Tribunal last week, has accused Mr Key of misrepresenting the negotiations with iwi leaders by indicating they covered all issues to do with water.
Mr Piripi said the iwi leaders' water forum was restricted to issues about the management of water rather than Treaty claims which were specifically excluded from the talks.
Those talks have been ongoing for about four years and Mr Key has argued that the forum is the best place to nut out the rights issues rather than through the courts.
Mr Piripi said the talks would be helped by a strong recommendation from the Waitangi Tribunal, but were restricted.