Prime Minister Christopher Luxon has met with Kīngi Tūheitia just days before a national hui.

In December, the Kīngitanga called a nationwide hui over fears of the coalition government's plans for Māori.

Iwi across the country are set to converge at Tūrangawaewae Marae in Ngāruawāhia this Saturday, to work out a unified response to the coalition government's policies.

Thousands are expected to attend the national hui, Tākiri Tū Te Kotahitanga, Tākiri Tū te Mana Motuhake, convened by Kīngi Tūheitia Pōtatau Te Wherowhero VII.

The invite was extended to iwi in December last year, following the 165th anniversary of the Kīngitanga movement.

The prime minister and Kīngi Tūheitia met on Monday morning, the prime minister's office said in a statement.

"Today Prime Minister Christopher Luxon and Minister for Māori Development Tama Potaka met with Kīngi Tūheitia at Ngāruawāhia," the statement says.

"The meeting had been planned since last year and was an opportunity to further build on the relationship they have established in the last two years."

Ariki and Leaders - including Te Ariki Tā Tumu Te Heuheu and Ratana Tumuaki, Manuao Te Kohamutunga Tamou - supported the call for a national hui and agreed the Crown must be a responsible Treaty partner and unify, not divide the nation.

Kīngitanga chief of staff Ngira Simmonds says rangatira from across the country highlighted a need to unify the nation and ensure all voices were heard in holding the government to account.

The divisive rhetoric used during the election campaign and policy targeting Te Tiriti o Waitangi and te reo Māori was offensive to Māori and non-Māori, Simmonds says.

"There's strong opposition to the government's statements on the Treaty of Waitangi, which could undermine decades of hard-fought justice and equality for our nation," says Simmonds.

"Now is the time for kotahitanga and focusing on what we have in common."

Waikato-Tainui will host the masses set to attend the hui and just last week the iwi filed proceedings at the High Court in Wellington against the Crown.

Executive chair Tukoroirangi Morgan says the iwi are seeking declarations to affirm the rights and interests of Waikato-Tainui and the corresponding obligations of the Crown.

"We are concerned about recent statements that have been made by Ministers within Cabinet and others within the coalition government (regarding prospective Crown decisions and actions) which would be in direct conflict with the Crown's commitments and related obligations to Waikato-Tainui," he says.

Waikato Tainui say the Crown has an obligation to protect te reo Māori under Te Ture mō te Reo Maaori 2016, and the proceedings at the High Court aim to address immediate concerns on those matters that were now under threat.

"We do this to protect what has been hard-fought, as we will not have the rights and interests of Waikato-Tainui or the relationship between Waikato-Tainui and the Crown undermined," says Morgan.

Many iwi have met ahead of the hui to finalise key messages and organise travel arrangements for whaanau wanting to attend.

The Office of the Kīngitanga and Iwi of Tainui Waka says more than 3000 guests will attend the hui and thousands more were expected to follow discussions online.

Ngira Simmonds says the hui would be positive and future focused.

"We have invited people to lay down their koorero and their aspirations and ideas for mana motuhake and upholding Te Tiriti o Waitangi.

"As signalled at Koroneihana last year, mana motuhake is an approach offering solutions and hope for the future of our nation. Māori can lead for all, and we are prepared to do that.

"The hui is open to all and will be conducted in accordance with tikanga."

The hui at Turangawaewae will be one of several opportunities for people to express their views and explore potential solutions.

RNZ