The pipeline would cross four states, including Iowa, and would transport crude oil from the Bakken Reserve in North Dakota to a refinery in Illinois.

Tribal members argue that it poses a threat to their water supply, while supporters argue that the pipeline is safer than transporting crude oil across the country on rails.

Stein said there’s simply no reason to build it because the country needs to end its reliance on fossil fuels.

She and other members of her environmentally focused political party have argued that the nation can and should wean itself entirely off fossil fuels over the next 14 years to help save the planet from climate change.

“We should be dismantling our pipelines, not building new ones,” said Stein, a medical doctor from Massachusetts who has never held elected office.

Stein is running a distant fourth in national polls, behind the two front-runner candidates: Hillary Clinton and Donald Trump. She also is trailing Gary Johnson, a former New Mexico governor who is running as a Libertarian.

Johnson is polling in the double digits in some states and in some national polls, while Stein remains firmly in the low single digits.