President-elect Joe Biden may cancel the permit for the controversial Keystone XL oil pipeline during his first days in office, capping one of the most fraught environmental battles in recent political history, accordant to several media reports Sunday.

The Canadian Broadcasting Corporation first reported Sunday night that the Biden transition team may move to cancel the permit for the oil project via executive action, potentially on his first day in office. Sources told the outlet the Biden team had drafted an internal planning document with a slate of early executive actions meant to reverse environmental policies from the Trump era. Canadas CTV and Reuters later confirmed the CBCs reporting.

The Keystone XL pipeline has been deeply controversial for more than a decade and faced a litany of legal challenges . If completed, it would carry up to 830,000 barrels of crude oil from Canadas tar sands into Nebraska, where it would then be ferried to refineries along the Gulf of Mexico. Backers have touted the effort as a job creator, but environmental groups have lambasted the pipeline as a leaking contributor to climate change.

The Biden transition team did not respond to a request for comment. The president-elect had previously said he was opposed to the project and his advisers said he would proudly move to block it once more.