A federal court in Alaska overturned on Tuesday night an oil and gas lease sale that had been mandated by the Biden administration’s signature climate law as part of a political compromise, on grounds that the U.S. government violated the law when holding the sale.

This ruling affects a lease sale held in December 2022 of offshore tracts for oil and gas development in the Cook Inlet in the northern Gulf of Alaska that had been mandated as part of a compromise to pass the 2022 Inflation Reduction Act.

The court decision is a victory for environmental groups that had objected to the inclusion in the IRA of oil lease sales that had been previously cancelled. The sale opened nearly a million acres of federal waters in Alaska to oil and gas development.

U.S. Senator Joe Manchin from conservative West Virginia, whose vote was crucial for passage of the IRA, tethered oil lease sales to offshore wind lease sales in the IRA to encourage U.S. President Joe Biden to continue to hold drilling auctions.