Even as House lawmakers investigate suspicious U.S. military refueling stops close to Donald Trump’s Turnberry golf resort, a Defense Department agency is finalizing a new contract for continued stops at the airport into 2024, The Scotsman newspaper has reported.

The House Oversight and Reform Committee is investigating refueling stops at the remote Glasgow Prestwick Airport just 23 miles from Trump’s Turnberry resort in Scotland. Military personnel stayed nights at Turnberry, spending federal funds for lodging and food that went to the president’s company, both Politico and The New York Times reported.

The fuel could have been obtained more cheaply at an American military base.

Both the government-owned Prestwick and Trump’s Turnberry have struggled financially, but their bottom lines have improved since Trump moved into the White House.

Prestwick’s refueling contract with the U.S. Defense Logistics Agency (DLA) is about to expire. Total payments to the airport since 2017 could total as much as $21 million by the time the contract ends, The Scotsman reported.

But the airport has a new, longer contract beginning Oct. 1 and running through the end of September 2024, the newspaper reported. The value is yet to be determined. But the new deal would involve supplying some 12.4 million gallons of aviation fuel — about 3 million more than the current deal, according to The Scotsman.

The House oversight committee has spent months looking into the U.S. military activity near Turnberry as part of its investigation into the Trump administration’s potential violations of the emoluments clause of the Constitution, which forbids presidents from using their office to enrich themselves.