Environmentalists are asking a federal judge to cancel permits and other approvals issued by the U.S. Army Corps of Engineers for the Keystone XL oil pipeline from Canada.
Attorneys for the Northern Plains Resource Council, Sierra Club and other groups filed the latest lawsuit against the long-delayed pipeline on Monday in Montana.
They claim the Army Corps did not examine the potential for oil spills and other environmental damages when it approved plans by pipeline developer TC Energy. The line would cross hundreds of waterways along a nearly 1,200-mile path from Canada to Nebraska.
An appeals court last month lifted an injunction that blocked construction of the project. That came after President Donald Trump issued a new permit in a bid to nullify a legal challenge to the pipeline.