Since April, the House Oversight Committee has been investigating why the crew on the C-17 military transport plane made the unusual stay — both en route to the Middle East and on the way back — at the luxury waterside resort, according to several people familiar with the incident. But they have yet to receive any answers from the Pentagon.

The inquiry is part of a broader, previously unreported probe into U.S. military expenditures at and around the Trump property in Scotland. According to a letter the panel sent to the Pentagon in June, the military has spent $11 million on fuel at the Prestwick Airport — the closest airport to Trump Turnberry — since October 2017, fuel that would be cheaper if purchased at a U.S. military base. The letter also cites a Guardian report that the airport provided cut-rate rooms and free rounds of golf at Turnberry for U.S. military members.

Taken together, the incidents raise the possibility that the military has helped keep Trump’s Turnberry resort afloat — the property lost $4.5 million in 2017, but revenue went up $3 million in 2018.