President Trump also used the media conference at Turnberry to hit out at wind turbines, which he branded “ugly monsters”.
He is a long-standing critic of turbines and previously lost a legal battle to block a wind farm from being built opposite his golf club in Aberdeenshire.
Trump said: “Wind is the most expensive form of energy and it destroys the beauty of your fields, your plains and your waterways.
“Wind needs massive subsidy, and you are paying in Scotland and in the UK, and all over the place, massive subsidies to have these ugly monsters all over the place.”
Instead, the president urged the UK to exploit North Sea oil and gas.
“When we go to Aberdeen, you’ll see some of the ugliest windmills you’ve ever seen, the height of a 50-storey building,” Trump said.
“You can take 1,000 times more energy out of a hole in the ground this big,” he added, gesturing with his hands.
“It’s called oil and gas, and you have it there in the North Sea.”