Nine-day march across New Zealand culminates in Wellington as huge numbers gather to protest bill that opponents say seeks to dilute Māori rights. What is the treaty principles bill? 00:19 More from the indefatigable Eva Corlett – a background explainer on the Treaty Principles Bill.

Thousands of protesters including Māori warriors in traditional dress marched on New Zealand’s parliament Tuesday in opposition to a draft law that they say would erode the rights of indigenous people.

A proposed bill would revise the country's foundational treaty with Maori people and is hugely unpopular. Here's what to know.