"Thank you to our partners in India, and their largest privately held Energy Company, Reliance, for this tremendous Investment," Trump said on social media platform Truth Social.

Reliance did not respond to an emailed request for comment.

Many Gulf Coast refineries are ​unable to process light, sweet crude oil from fracking shale fields because they were configured in the last 40 years to run lower-cost heavy, sour crude, ​which has higher density and contains more sulfur.

A "global supermajor" has provided a "9-figure investment" at a "10-figure valuation," America First said.

Trump named the investor as Reliance, India's largest private-sector company.

Reliance has signed "a binding 20-year offtake term sheet" with America First, meaning it will buy products the refinery produces. That will help cut India's trade surplus with the U.S., which has been ​a Trump grievance.

"Initial announcements like this by the Trump administration have a ‌lot of ⁠hyperbole," said Refined Fuels Analytics managing director John Auers.

The new refinery will "fuel U.S. markets, strengthen our national security, boost American energy production, deliver billions of dollars in economic impact, and will be the cleanest refinery in the world," Trump said on Truth Social.

Gulf Coast refineries have advantages over plants elsewhere in the U.S., said Kloza Advisors principal analyst Tom Kloza.

"If Brownsville is indeed the location for the build, I would assume that they are looking at an export ​refinery," Kloza said. "There is not much ​local demand and there are not ⁠pipeline connections to take Brownsville product elsewhere."