A lawsuit from two Sioux tribes seeking suing to stop the Dakota Access oil pipeline was put on hold while a separate but related court battle over the project plays out. Dallas-based pipeline developer Energy Transfer Partners is asking U.S. District Judge James Boasberg in Washington, D.C., to rule that the company received proper permission from the Army in July to lay pipe under a Missouri River reservoir in North Dakota – the last remaining chunk of construction for the $3.8 billion project.