Trump had 'nothing to do' with resort stay

US President Donald Trump has dismissed allegations of impropriety over Vice President Mike Pence's stay at Trump's Irish resort and a stopover at a Scottish airport near a Trump-owned golf course.

"I had nothing to do with the decision of our great @VP Mike Pence to stay overnight at one of the Trump owned resorts in Doonbeg, Ireland," he wrote in an early-morning tweet on Monday.

"I know nothing about an Air Force plane landing at an airport (which I do not own and have nothing to do with) near Turnberry Resort (which I do own) in Scotland, and filling up with fuel, with the crew staying overnight at Turnberry (they have good taste!). NOTHING TO DO WITH ME," he also tweeted.

Democrats in the US House of Representatives are looking into Pence's stay at the Trump International Golf Club in Doonbeg on the west coast of Ireland, which is 300km from the capital, Dublin, where his meetings were held.

They are also concerned about the stopover at Glasgow's Prestwick Airport, near a Trump-owned golf course, which has benefited from US defence purchases of fuel, and, according to media reports, has offered visiting air crews free rounds of golf at the course.