Maori Party co-leader Marama Fox said her party had a fundamental difference of opinion with National over a bill dealing with children in state care.
But she dismissed suggestions it could end the party's relationship with National, which it supports on confidence and supply.
"Our first option is to fight for our tamariki and you don't do that if you walk away," she told reporters at Parliament.
She believes the new organisation that will deal with children in state care should have a more Maori focus in the way it operates because so many children in state care are Maori.
"If we are to believe the statistics that say 63 per cent of children in the care of Child Youth and Family are Maori and 71 per cent of young people in prison are Maori, is the Government prepared to continue to negotiate with the Maori Party to ensure that the rebuild of Oranga Tamariki is done with a kaupapa Maori perspective?" she asked Prime Minister Bill English in Parliament.