More than two dozen Democrats in Congress are demanding the White House pause construction on the Line 3 project and carry out new environmental studies.
Critics say officials are ignoring the potential threat to wildlife and the environment.
The congressman urged state officials to think about climate change, pollution and Native American rights.
Why understanding Native American religion is important for resolving the Dakota Access Pipeline crisis
Not just Dakota Lakota scholar Vine Deloria Jr. described the "sacred stones" in North Dakota in his book "The World We Used
They fear the pipeline will jeopardize drinking water and sacred sites.
Standing Rock Sioux Reservation members are running 2000 miles to deliver a petition to lawmakers, asking them to stop an oil pipeline that risks polluting their ancestral lands.