Brazilian prosecutors and advocates for Indigenous people are suing to force electoral authorities to help voters in remote Amazon communities exercise their constitutionally guaranteed right to cast ballots in Sunday's presidential runoff.

Leftist President Luiz Inácio Lula da Silva and his far-right challenger, Sen. Flávio Bolsonaro, a son of former President Jair Bolsonaro , have markedly different approaches to protecting the Amazon, and the race is tight according to recent polls.

The Articulation of Indigenous Peoples of Brazil, known as Apib, announced Thursday that it filed an urgent request for the Justice Inspector General’s Office to make sure electoral officials act quickly to help Indigenous people reach voting centers.

And federal prosecutors filed a lawsuit Wednesday in federal court in Para seeking a nationwide order to ensure Indigenous peoples can vote, by providing free transportation by river, land or air, and by funding food, interpreters, cultural facilitators and signs in Indigenous…