The company behind the Keystone XL pipeline has not yet determined whether there is enough demand for the project to justify actually building it, a top executive said today.

It was the strongest acknowledgment from TransCanada to date that the nearly decade-long Keystone saga may end in failure — despite President Donald Trump’s overwhelming support for the project, which he green-lit as one of his first acts in office. The company says it remains confident in the project. But it has been struggling to find enough customers, and it still needs approval from Nebraska regulators for the pipeline’s route, which landowners and activists in the state have been fighting since the project was first proposed.