Hone Harawira has launched a scathing attack on the Māori Party's Māori land reform Bill, describing it as "a poisonous and destructive cancer".
The Mana Party leader signed an agreement with the Māori Party earlier this year, but says that doesn't prevent the parties from critiquing each other's policies.
In an interview with The Hui on Sunday about Te Ture Whenua Māori, Harawira said that like cancer "the whole thing needs to be cut out".
His views echo those of a group of esteemed Māori land experts, who wrote an open letter to the Government this week calling for the Bill to be thrown out.
Under the proposed legislation, the Māori Land Court will have its powers transferred to a government agency.
The Māori Party has made some changes to the Bill, but despite criticism continues to support it.
Under the Mana/Māori deal the two parties won't run against each other in the Māori electorates, however Mr Harawira told The Hui he would not support any candidate who backed the bill.
Watch the video for the full interview from The Hui.