As the pipeline prepares to double its daily output, the tribe demands a new environmental assessment of the project.

Standing Rock Sioux tribe member Chase Iron Eyes will argue that the Dakota Access Pipeline’s negative impact on Native communities justified his actions during the protests.

A U.S. District Court judge will hear arguments from both sides throughout the summer.

The Army Corps of Engineers did not “adequately consider the impacts of an oil spill on fishing rights, hunting rights or environmental justice,” per the court order.

The 1,172-mile long crude oil pipeline is not yet operational.