The argument began after Trump criticised the UK government for its policy of supporting the expansion of wind farms in Scotland. One wind farm in particular, 1.9 miles from Trump's controversial Aberdeenshire golf course, raised the business magnate's ire.
The Apprentice USA star tweeted: "How can George Osborne reduce UK debt while spending billions to subsidize Scotland's garbage wind turbines that are destroying the country?You're all wrong—check the facts! UK is massively subsidizing Scotland's wind turbines & the people don't want them."
The Apprentice UK businessman replied: "Scottish don't want wind turbines........I think you have that wrong . The Scottish don't want you !"
The exchange that followed is detailed in full below:
Trump: "If you think ugly windmills are good for Scotland you are an even worse businessman than I thought...... and, in my opinion, should not be doing The Apprentice."
Sugar: "well you have NO SAY in that. The British like me not you...the ugly windmills will bring more revenue and green power to Scotland than your golf project."
Trump: "Sugar—unlike you, I own The Apprentice. You were never successful enough...... to do The Apprentice but I approved you anyway. Without my show you'd be nothing!"
Sugar: "You approved me! What a load of rubbish dream on You don't own apprentice Mark Burnett does. Shut up and argue with Obama. success is measured with what you have in business.I own all my real estate with no bank borrowing how about you big shot?"
Trump: "Sugar-Keep working hard so I make plenty of $ with your show......You have little persona, but The Apprentice concept is great and lucky for you!"
Sugar: "success is measured with what you have in business.I own all my real estate with no bank borrowing how about you big shot?You have had a charisma bypass."
Trump: "When I made The Apprentice the #1 show in the US, that was a good day for you...... and many others. Drop to your knees, Sugar, and say thank you, Mr. Trump."
At this point, Sugar's regular Twitter sparring partner and Celebrity Apprentice USA winner Piers Morgan interjected: "Don't wish to interfere obviously @realDonaldTrump - but it may be time to fire @Lord_Sugar from YOUR show for his impertinence?"
Trump: "@piersmorgan @Lord_Sugar I easily could but as long as Sugar is making me money (it's my show) I won't--unlike Sugar, I'm not stupid!"
Sugar: "@realDonaldTrump @piersmorgan you are full of sh.. Trump you have no power over the UK Apprentice, just like the Scottish people."
Trump: "Dopey @Lord_Sugar—Look in the mirror and thank the real Lord that Donald Trump exists. You are nothing!"
Sugar: "you only have 1.9 m followers not good for your ego how comes I have 2.5m and you have 6 times more population than UK."
The heated exchange drew a range of comments from other Twitter users too.
Referencing Sugar's support of Tottenham Hotspur, Alastair Campbell wrote to Trump: "your concern for Scotland's beauty/success is as genuine as concern @Lord_Sugar has for Arsenal #stickHairAndCourseUpBum"
Caitlin Moran tweeted during the exchange: "Lord Sugar vs Donald Trump on Twitter is like a 50ft high Mr Burns and a 50ft high Del Boy fighting in the middle of Tokyo #rivetted".
Shooting Stars comedy character Angelos Epithemiou added: "Cor @realDonaldTrump and @Lord_Sugar locking horns on twitter! It's like Megatron vs Optimus Prime," while Matt Berry commented: "Sugar should play his Trump card. I'm surprised he hasn't."