Maori Party co-leader Tariana Turia says it was "disappointing" the Prime Minister did not not recognise the magnitude of Section 9 of the State Owned Enterprises Act 1986.
And he had made a "mistake" to say it was largely symbolic and had not been used.
Writing for the Herald today she explains why she and Maori feel strongly about Clause 9 and why she said the Maori Party could reconsider its support for National.
Clause 9 says: "Nothing in this law shall permit the Crown to act in a manner that is inconsistent with the principles of the Treaty of Waitangi."
Mrs Turia said those words established a platform for the pathway to nationhood "which enable all of us to call New Zealand home".