By Lucy Craymer and Lewis Jackson WELLINGTON (Reuters) -Tens of thousands of New Zealanders rallied in front of parliament on Tuesday in one of the country's largest ever protests to oppose a bill, which opponents say seeks to dilute the rights of Maori and threatens to set race relations back decades.

Booming Indigenous Maori "haka" chants rang out across New Zealand's capital on Tuesday, as tens of thousands rallied against a conservative push to redefine the nation's founding treaty.

Protesters oppose a bill drafted by a minor coalition party that aims to redefine a founding treaty of the country dating back to 1840.