During that flight, seven active duty and National Guard crew members stayed at Turnberry.
In a statement released Sunday evening, the Air Force admitted that while those crews appeared to follow all guidelines and procedures, staying at the president's higher-end hotels might be allowed "but not advisable".
Today, Rep. Elijah E. Cummings, the Chairman of the Committee on Oversight and Reform, and Rep. Jamie Raskin, the Chairman of the Subcommittee on Civil Rights and Civil Liberties, sent a letter to Secretary of Defense Mark Esper demanding immediate compliance with the request they sent in June seeking documents relating to taxpayer funds spent at President Trump's Turnberry golf resort in Scotland in apparent violation of the Domestic Emoluments Clause of the Constitution.
Cummings is also concerned about Scotland's Prestwick Airport, looking into purchase orders for fuel totaling $11 million and reports that the airport offered cut-rate rooms for select passengers and crew, as well as free rounds of golf at Turnberry to visiting USA military and civilian air crews.
In March, while enroute to Kuwait, an Alaska-based C-17 had made a refueling stop at Prestwick Airport in Scotland and overnighted at the nearby Trump Turnberry resort.
According to Air Force statistics the number of overnight stays has increased from 40 in 2015 to 220 by August 2019.
Air Force officials do not know how many of those overnight stays occurred at the Turnberry property. Prestwick also "provided cut-rate rooms and free rounds of golf at Turnberry for USA military members", according to Politico.
Democrats have also expressed concern over reports of several United States military personnel staying at a Trump-owned hotel resort in Scotland. The Turnberry resort reportedly lost $4.5 million in 2017 but saw revenue climb $3 million in 2018. CNN reported that in 2017 the Air Force also said Prestwick had "more favorable weather than nearby Shannon Airport, and less aircraft parking congestion than locations on the European continent". The [DOD] also claimed that it has "increasingly leveraged Prestwick as a stopover location" and stated that in the first eight months of this year, [DOD] aircraft made 259 stops-220 of which were required overnight crew stays.
He stayed at Trump International Golf Links & Hotel in Doonbeg on Ireland's west coast despite his meetings the same day in Dublin, which is on Ireland's east side, 182 miles away.
Marc Short, the vice president's chief of staff, previously told reporters that although Trump had not directed Pence to stay at his resort, he suggested doing so.
Later Mr Pence's team put out a statement to say: "at no time did the President direct our office to stay at his Doonbeg resort and any reporting to the contrary is false".
Trump tweeted this afternoon, denying his involvement in the decision and contradicting Pence's spokesperson.