Donald Trump "cheats like hell" at golf and routinely lies about his score, a professional who plays regularly with him has claimed.
Suzann Pettersen, who has known Mr Trump for over ten years, said that she laughs at the US president’s scores because they bear no relation to reality.
Pettersen, who is a former LPGA Tour winner and has often played with Mr Trump, said that he usually skips his final putt in case he misses it.
The Norwegian former world number two even hinted that Mr Trump pays his caddies to return balls he has hit towards the woods back onto the course.
Mr Trump is an avid golfer and is estimated to have spent more than 90 days playing the sport since he entered office.
The president has claimed he has achieved scores of 68, which would class him as a highly skilled golfer, particularly at the age of 71.
But Pettersen said while "golf is the only thing the man thinks about", he is not quite as skilled as he would like people to believe.
"He cheats like hell… so I don’t quite know how he is in business," she told Norwegian newspaper Verdens Gang.
"They say that if you cheat at golf, you cheat at business."
Revealing some of his techniques, she said Mr Trump often opts to add a shot without actually taking his final putt, probably because his putting is not very good.
She said: "He always says he is the world’s best putter. But in all the times I’ve played him, he’s never come close to breaking 80.
"But what’s strange is that every time I talk to him he says he just golfed a 69, or that he set a new course record or won a club championship some place. I just laugh."
Pettersen said that she got on well with Mr Trump because she does not take "everything he says literally".
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"You’ll never meet another person who loves himself as much as he does," she said, "but I know how much he cares".
Before he was president, she added: "He called me once a month and asked how things were going. It was always about golf."
Mr Trump has also been extremely helpful when she asked him for business advice, she said.
The 36-year-old said whenever Mr Trump appeared he would discuss the golf matches they had played against each other.
She added: "And then he would say that [Norwegian businesswoman] Celina (Midelfart) was his greatest love. He has told that same story a hundred times … If you would ask her, the story is no doubt completely different."