President Donald Trump is being investigated by a US Congressional committee in connection with a potential conflict of interest over military spending at a Scottish airport which is near his golf resort.

According to the House Oversight and Reform Committee, expenditure at the Prestwick airport has "increased substantially" since Trump came into office, the BBC reported on Saturday. The debt-ridden airport, south of Glasgow and approximately 30 km north of Trump Turnberry has been fighting off closure. The airport is integral to Trump's business and is making losses.