Winston Peters won't say if a referendum on abolishing the Māori seats would be a post-election negotiations sticking point.

He's announced the NZ First policy today - reigniting its 2017 campaign, which didn't make it into the coalition agreement with Labour that year.

Peters says things could be different this election. 

"No use saying it's the bottom line if they don't give you the tools - how can it be a bottom line? If you walk in here with not enough votes, you're not going to be able to get there."

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