A combination of factors led to former ACT Party leader Richard Prebble stepping away from the Waitangi Tribunal.

He's resigned after being appointed in October.

The tribunal was established in 1975 in a bid to deal with unresolved Treaty grievances.

Prebble claims the Tribunal doesn't take any notice of Parliament - and says it believes there's two Treaties.

He says it's creating more grievances.

"It's a rewriting of history - and I know historians do re-interpret history, but one thing you can't do is you can't bend facts."

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