Opponents of the Dakota Access oil pipeline are taking issue with the format of private oral testimony in meetings for public comment on a draft environmental review of the controversial pipeline. The U.S. Army Corps of Engineers is in the midst of two public comment meetings in Bismarck, North Dakota, the first held Wednesday, the second set for Thursday. The Standing Rock Sioux Tribe has long opposed the pipeline due to the risk of an oil spill contaminating the tribe's drinking water supply.