Donald Trump has left for the US after a whirlwind four-day trip to Scotland. The president mixed business with pleasure in the "private visit", agreeing a major trade deal and meeting the UK and Scottish heads of government in between rounds of golf.

U.S. President Donald Trump formally opened a new golf course at his sprawling property in Scotland on Tuesday, saying he would play a quick round before heading home to focus on addressing crises in the Middle East and elsewhere.