The Latest: Tribe files legal challenge to pipeline's finish
The Cheyenne River Sioux worries a pipeline leak could contaminate its drinking water.
President Donald Trump signed an executive action in January instructing the Army Corps of Engineers to advance pipeline construction.
The company building the disputed Dakota Access oil pipeline has started construction on the final stretch of the $3.8 billion project.
The work had been stalled for months due to opposition by the Standing Rock Sioux, but President Donald Trump last month instructed the Army Corps of Engineers to advance pipeline construction.
The tribe fears a pipeline leak could contaminate its drinking water.
The tribe fears a pipeline leak could contaminate its drinking water.