A fossil fuel giant with deep ties to Supreme Court justice Neil Gorsuch, along with other powerful pro-business groups, is explicitly pressuring Gorsuch and his fellow justices to rule in favor of oil and gas interests in an upcoming Supreme Court case.

If the high court agrees, not only could it help authorize a controversial crude oil train running alongside a critical waterway, it could also invalidate the constitutionality of one of the country’s preeminent environmental laws.

Petitioners in the case, Seven County Infrastructure Coalition v. Eagle County, Colorado, are challenging an environmental review process that’s holding up an eighty-eight-mile rail line project designed to transport crude oil just feet away from a fragile Colorado River tributary that forty million people rely on — and where an oil spill could be catastrophic.