US President Donald Trump once boasted of turning his back on a dying man (AFP Photo/MANDEL NGAN)

Donald Trump once boasted of how he refused to help an 80-year-old man who had fallen off a stage and seriously hit his head at a charity dinner.

The shock admission came during a 2008 interview with US shock jock Howard Stern, and saw Trump describe the elderly man’s injury as ‘disgusting.’

Describing the incident, which happened at Trump’s Mar-a-Lago resort in Palm Beach, Florida, he said: ‘We had the Marines. And the Marines were there, and it was terrible because all these rich people, they’re there to support the Marines, but they’re really there to get their picture in the Palm Beach Post.

‘So, you have all these really rich people, and a man, about 80 years old – very wealthy man, a lot of people didn’t like him – he fell off the stage. So what happens is, this guy falls off right on his face, hits his head, and I thought he died.

‘And you know what I did? I said, “Oh my God, that’s disgusting,” and I turned away.

‘I couldn’t, you know, he was right in front of me and I turned away. I didn’t want to touch him. He’s bleeding all over the place, I felt terrible.

‘You know, beautiful marble floor, didn’t look like it. It changed colour. Became very red. And you have this poor guy, 80 years old, laying on the floor unconscious, and all the rich people are turning away.’

Instead, the then-businessmen sat back and allowed a group of marines to take over as they rushed to the man’s aid.

‘What happens is, these 10 Marines from the back of the room’, Trump boasted.

‘They come running forward, they grab him, they put the blood all over the place—it’s all over their uniforms—they’re taking it, they’re swiping [it], they ran him out, they created a stretcher.

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‘They call it a human stretcher, where they put their arms out with, like, five guys on each side. I was saying, “Get that blood cleaned up! It’s disgusting!” The next day, I forgot to call [the man] to say he’s OK.

‘It’s just not my thing.’

The bizarre admission is only one of several questionable remarks that Trump has made on the Howard Stern show, having previously admitted the unorthodox relationship he has with wife Melania in public.

He also previously admitted that he said ‘Oh great’, when ex-wife Marla Marples revealed she was pregnant with daughter Tiffany in 1993.