He used taxpayer money to help build his golf course. And lots of it:

“The cost of cleanup was picked up by taxpayers, and the developer would be allowed to build a course atop the site at its own expense, under strict regulations. In recent years, Liberty National's price tag has been reported as $250 million. About 90 percent of that figure were Superfund cleanup costs.”

https://www.golfdigest.com/story/the-presidents-cup-on-the-hudson