Scots were left outraged when Barack Obama was given a sugar-free Irn Bru during his visit to Scotland last week.

The former US President was enjoying a round of golf at the Old Course at St Andrews when he was handed a sugar-free version of the iconic Scottish drink.

Unlike Donald Trump, Mr Obama has never visited Scotland before. Twitter erupted with angry Scots dismayed that this was the former President's first experience with Irn Bru.

Matt Kilcoyne posted: “Who the hell gave Obama sugar-free Irn Bru?!?! What treachery to all that is Scottish and holy is this?”

Another wrote: “Obama was POTUS, give the guy some full fat Irn bru for Christ sake.”

One user believed that this was a punishable offence: “Who ever gave Obama Diet Irn Bru needs to be met with the full force of the law.”

Barack Obama enjoyed a round of golf at St Andrews Thursday during his first visit to Scotland (Getty)

Mr Obama spent the rest of his time at the course meeting locals and working on his golfing skills. Joseph Lynch, 11, told the Edinburgh Evening News: “It was brilliant. He asked what was my name, how old I was and told me that I was a good-looking guy. Apart from missing a shot a couple of minutes ago, he seems quite good at golf.”

Marcus Tannerbaurer, 26, a student at the University of St Andrews was impressed with the former President's ability on the course. He said: “We shook his hand, he seemed really nice. I’m not one to judge, because I’m not very good, but he seems pretty good.”