Deputy Prime Minister Barnaby Joyce's comments about a new Indigenous chamber of parliament show he misunderstands the proposal, an Indigenous policy adviser says.

Earlier today, Mr Joyce said any proposal for an Indigenous chamber of parliament would be self-defeating, arguing it would be unlikely to win public support at a referendum.

The Uluru statement issued after last week's meeting of hundreds of Indigenous delegates called for "a First Nations voice enshrined in the constitution", without spelling out what form that would take.

Mr Joyce said he had seen articles suggesting it could mean an Indigenous chamber in parliament and said that would be overreach, if you "ask for something that will not be supported by the Australian people, such as another chamber in politics or something that sits beside or above the Senate, that idea just won't fly".

But senior policy adviser at the Cape York Institute, Shireen Morris, said last week's Indigenous meeting at Uluru did not call for a separate parliamentary chamber.

"There is no suggestion at all there should be a new third chamber of Parliament," Ms Morris said.

"I think the deputy Prime Minister perhaps misunderstands the nature of the proposal.

"The proposal for a first people's voice is a proposal for an external advisory body, so an advisory body that is outside parliament, outside government.

"It really is a very modest and constitutionally conservative proposal and all it is is a constitutional mechanism guaranteeing that Indigenous people can have a say, can give advice on laws and policies that are made about them."

The Uluru statement issued last week called for a "first nations voice enshrined in the constitution". ( ABC News: Stephanie Zillman )

Prime Minister to see final report by June 30

Referendum Council co-chairman Mark Leibler has explained that last week's Uluru declaration will only be a part of the final report.

Last week's meeting was the last of a series of Indigenous dialogues.

Mr Leibler said they are one part of the content of the final document.

"They will factor into the report which the Referendum Council will give by June 30 to the Prime Minister and the Leader of the Opposition," he said.

"[Uluru] will tell us what Indigenous people want to have, and what they definitely don't want to have as far as constitutional reform is concerned.

"Obviously the Referendum Council is not going to recommend any particular referendum which is opposed by our Aboriginal and Torres Strait Islander peoples."

Mr Leibler said the next step would be to receive the full report from the Indigenous steering committee of the Referendum Council, "so that we understand clearly what has emerged from these dialogues".

He said the Uluru statement would be given "a great deal of weight".

But he also noted warnings from senior political figures, including Prime Minister Malcolm Turnbull, that controversial proposals would not succeed.

"Very mindful, because I think everyone who sits on the Referendum Council would agree with that judgement by the Prime Minister," Mr Leibler said.

"But on the other hand you have to withhold judgement on that until you see what the Referendum Council is going to recommend."

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