"I am asking the Tribunal to consider this claim urgently because too many Maori are suffering right now while the Crown ignores its failure to reduce the numbers of Maori in prison and reoffending on release," Mr Hemopo said.
"I hope by hearing this claim urgently, the Tribunal will hold the Crown to account. But more importantly I hope it will challenge the stereotype that there is something about Maori that makes us criminals."
Mr Hemopo said that if the Tribunal agrees to hear the claim as a matter of urgency, iwi groups and expert witnesses will present evidence in the coming months.
In 2004, the Waitangi Tribunal heard another urgent claim from Mr Hemopo, alleging that an assessment system the Corrections Department introduced in 2001 to reduce Maori reoffending has actually entrenched prejudice and discrimination.
He said this claim alleged a much wider, long term failure by the Crown.