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Just as TransCanada Corp.’s Keystone XL pipeline finally seemed ready to roll, activists are taking one more shot at stopping it.

A year after President Donald Trump gave the O.K. for the line to be built, groups including Bold Alliance and Sierra Club argue in a motion that the federal decision short-circuited the review process, relying on an outdated environmental assessment.

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The U.S. State Department failed to adequately explain the reversal of its 2015 denial of the permit under the Obama administration, according to a complaint filed Friday in a federal court in Montana.

The challenge comes less than three months after the state of Nebraska approved the project and TransCanada has signalled it’s prepared to go ahead with construction, though the Calgary-based pipeline giant hasn’t made a final decision yet.