Asked how'd she react if the case ultimately wound up before the US Supreme Court, Carmen told host John Kiriakou that she doesn't exactly have a lot of faith in the highest court, "especially stacked as it is right now".
The 1,900-kilometer-long pipeline is created to transport up to 830,000 barrels per day of tar sand oil from Alberta, Canada, to Nebraska, where it would then enter existing pipelines to U.S. Gulf Coast refineries.
Trump, a Republican, said the project would lower consumer fuel prices, create jobs and reduce US dependence on foreign oil.
"The Trump administration tried to force this dirty pipeline project on the American people, but they can't ignore the threats it would pose to our clean water, our climate, and our communities", Mr Hayes added.
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Energy producers in the northern nation already are struggling with a shortage of pipeline space that has hammered prices for their crude, sending its discount to USA benchmarks to the widest on record in recent weeks. "TransCanada does not have an approved pipeline at this point".
Noting that former US president Barack Obama had appointed Morris to the court, McConaghy said opponents of the pipeline had "shopped (the case) as best they could to find a pliant federal court judge who had some nexus to the project". TransCanada, the Calgary-based group behind the project, did not respond to request for comment early Friday morning. "In response, the State Department is likely to take a two-track approach where it will appeal the court's order and simultaneously work on crafting a decision that satisfies the court's findings".
Morris' court order said the administration's use of a 2014 environmental review to justify a presidential permit for construction violated three federal laws - the National Environmental Policy Act, the Endangered Species Act and the Administrative Procedure Act. The lawsuit prompting Thursday's order was brought by a collection of opponents, including the indigenous Environmental Network and the Northern Plains Resource Council, a conservation coalition based in Montana.
Moving forward, environmentalists and Native Americans need to stand their ground and continue to fight against the Keystone XL pipeline until it's dead in the water, she told Kiriakou.
A shortage of export pipeline space to carry away growing oil production in Alberta has been blamed for recent steep discounts in prices for Canadian oil as compared to New York-traded benchmark oil. The State Department initially denied the pipeline a permit in 2015, under the Obama administration.
The company responded by seeking $15 billion in damages. The announcement followed an environmental impact review from the U.S. State Department, which concluded the pipeline's impact on the environment would be "negligible to moderate". He signed an executive order supporting its construction in March of a year ago.