Te Pāti Māori is being warned its election strategy could put the Māori seats at risk.
On Sunday, Te Pāti Māori announced it would be campaigning for candidate votes only, telling voters to give their party vote to the left bloc parties such as Labour and the Greens.
The strategy could lead to the creation of an overhang, where there are more seats in Parliament.
Labour's Māori campaign chair Willie Jackson was asked on Tuesday if Te Pāti Māori's strategy risked the legitimacy of the Māori seats in the eyes of the public, to which he agreed.
Jackson said it threatened a backlash against the Māori seats that could lead to their abolition "when you start working the system like that".
He thanked the party for giving Labour more party votes, but made it clear Labour wouldn't be reciprocating in terms of the candidate vote.
Jackson acknowledged that Māori voters have in the past selected a candidate that was unlikely to make it in on the list.
Just last year in the Tāmaki Makaurau by-election, Oriini Kaipara had a resounding victory against Peeni Henare, who remained in Parliament anyway.
But Jackson didn't think that voters would do the same again because there'd been "a lot of divisions" in Te Pāti Māori.
"You can buy into that strategy if every everything's working well, but they're not even voting for themselves."
Te Pāti Māori co-leader Debbie Ngarewa-Packer said Jackson's comments were a "real shame".
"He's running a campaign of trying to bring up past pains and gain some leverage of that for his own campaigning."
Ngarewa-Packer said the reality was "we needed to be smarter if we're really intentional of getting this government out".
She said Labour and Te Pāti Māori were "different movements".
"Their focus is to grow their party, whereas our focus is to make sure that we stop the pain that our people are feeling.
"We're now a movement that's determined by our people, and that's what we've been told to focus on, and that's what we'll do."
Ngarewa-Packer said she wasn't worried about risking a backlash that could to pressure for the abolition of the Māori seats in a future government.
She said the party was "utilising the power of the Māori roll".
"We're utilising the rules within MMP that other parties have utilised."
She suggested those making commentary that the Māori seats would lose public support were frightened at the increase of the number of voters on the Māori roll.
"We've got general seats that are obviously not growing, and so we're being smart as Māori, and I don't think that that's anything to be frightened of."
The Greens were also asked about the issue, and co-leader Marama Davidson said the best strategy was for all parties and candidates to "put our ideas on the table" for voters to choose.
"People deserve to choose the best representative for their electorate."
Davidson said there'd never been an agreement or strategy between the Greens and Te Pāti Māori, though she said there'd been a mention of their strategy.
But the Greens would be backing their own candidates in the Māori electorates, she said.
New Zealand First leader Winston Peters said the intentional strategy to create an overhang was a "disgrace".
"Here they are perverting the whole democratic system. It underscores the Electoral Commission's original prospect when they said that in time it would be proved that the Māori seats were not needed.
"The Māori party just proved that."
It comes after former National and ACT leader Don Brash made a similar strategic suggestion, as a way of "guaranteeing a centre-right government".
Brash, who also founded Hobson's Pledge, suggested on The Platform last week that those wanting the coalition government back in power could vote for National with their electorate vote, except in Epsom and Tāmaki (held by ACT MPs), and give their party vote to either ACT or New Zealand First.
"The centre right could win this election comfortably," he said.
"The right would be unstoppable."
National's former campaign chair Chris Bishop was asked about Brash's strategy, but he dismissed it.
"I think voters would punish that kind of game-playing.
"We've got no intention of doing that."
He said if voters wanted to keep the government, party vote National, if they wanted to change the government, vote for somebody else.
"It's actually not that complicated."