In his most recent financial disclosure, Trump reported hundreds of millions in income from his various properties, including golf clubs and his Mar-a-Lago estate and club. He has also earned millions from other business ventures, including trademarking merchandise like watches and fragrances.

Trump arrived in Scotland on Friday, with hundreds of people on hand to watch the arrival in Glasgow of Air Force One, the presidential aircraft. He told reporters that he will visit his two golf properties in Scotland - one in Turnberry on the west coast where he is playing on Saturday and the other near Aberdeen.