In a signal of what might lie ahead in the contentious battle over the Keystone XL oil pipeline, the company behind the proposed project, Calgary-based TransCanada, suggested this week that legislative efforts underway in Nebraska to force a rerouting of the pipeline could prove unconstitutional.

The Nebraska legislature, at the urging of the state’s governor, opened a special session Tuesday during which lawmakers were expected to begin introducing myriad bills designed to tweak Nebraska’s pipeline siting and safety authority. For many lawmakers, the overarching goal is to force TransCanada to seek a different route for the pipeline, which as currently conceived would cut through a sensitive region known as the Sand Hills — part of the larger, multi-state Ogallala aquifer.

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