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.

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

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.