pipeline

The groups contend the approval of the pipeline project in November violated the Endangered Species Act.

The move pushes the controversial $8 billion project closer to construction, but it still faces court challenges.

They also question whether the Pipeline and Hazardous Materials Safety Administration is providing adequate oversight of it.

They say some wetlands were affected, but not any sources of drinking water.

The company and regulators said the cause was being investigated.

A hearing is set for Nov. 13 in Linton on the proposed expansion.

Some Democratic candidates have been eager to draw a contrast.

TC Energy argued in Nebraska that the so-called mainline alternative route was a legitimate option.

Opponents filed a lawsuit arguing the company didn't follow all the required procedures for the route that was approved.

It's designed to move 350,000 barrels of oil daily from western North Dakota's oil patch to Cushing, Oklahoma.