The chairperson of the Ngati Apa Runanga suspects the Government has already drawn up new legislation on the partial asset sales.
A series of iwi consultation hui are being held throughout the country.
The third, which drew more than 100 people, was held in Whanganui on Thursday 9 February.
The head of Ngati Apa, Adrian Rurawhe, says there is anxiety among Maori that treaty rights will be lost if a clause in the current State Owned Enterprises Act is not retained.
He questions why there is such a short time frame for submissions on the matter.
Mr Rurawhe says he worries this lack of time means the Government has already written up a new Act, and consultation will not make much difference.