The Sioux tribe is facing a pro-oil president-elect with personal investments riding on the completion of the Dakota Access pipeline.

Less than 12 hours after Donald Trump walked onto a New York City stage as the newly elected president, the stock price for Energy Transfer Equity shot up 15 percent. Among that company’s holdings is Energy Transfer Partners, operator of the controversial Dakota Access pipeline. Protesters near the Standing Rock Sioux Reservation continue to fight completion of the $3.8 billion project. But the jump in share price indicates an immediate pro-energy confidence in Trump.

And that confidence is not unfounded.

In Bismarck, North Dakota, Donald Trump gave a speech in May that would help secure his seat as America’s 45th president. The candidate was lagging 30 delegates to become the Republican nominee. His decision to address oil entrepreneurs in North Dakota was political strategy. At a petroleum conference, Trump introduced his energy plan for the first time: more fossil fuels, fewer regulations, and a vow to undo many of President Obama’s climate initiatives. Trump would meet the required 1,237-delegate threshold to go on and win the presidency, a startling upset for an outsider who has disrupted the political establishment.

What a Trump victory may spell for the continued battle over the Dakota Access pipeline—and for indigenous rights, in general—is alarming.

For starters, President-elect Trump would stand to personally profit from the project. His campaign energy adviser, Harold Hamm, would also see gains. Hamm is the CEO of Continental Resources, which has plans to flow its supply of Bakken fracked crude through the pipeline. With Trump’s recent victory, Hamm is also on the short list of becoming U.S. energy secretary.

As Politico reports, Trump is also seriously considering 74-year-old Forrest Lucas, of oil products company Lucas Oil, as a top contender for interior secretary, along with “Drill, Baby, Drill” Sarah Palin.

This political changeover has come at a critical time in the struggle at Standing Rock.