Madonna has slammed Donald Trump's sons, Donald Trump Jr and Eric Trump, for the slaying of an innocent wild animal after they once posted a trophy photo of the dead leopard.

She uploaded the old photo onto her Instagram with the caption:

'How Big of. Pussy Do you have to BE to kill this Nobel Animal for sport? Just ask Donald Trump Jr and his brother Eric. One more reason to vote for Hilary!

The photo is rumoured to be taken in 2011 during a safari trip in Zimbabwe. There are similar photos of the two brothers posing with dead crocodiles and elephants.

Republican candidate, Donald Trump, has said in the past:

"My sons love to hunt. They are members of the NRA (National Rifle Association), very proudly. I am a big believer in the second amendment. But my sons are hunters. Eric is a hunter and I would say he puts in on a par with golf. If not ahead of golf. They're great marksman (sic). great shots, they love it."

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Watch Donald Trump Jr and Eric Trump be interviewed, and footage of Madonna attending MOMA's 25th Anniversary Screening of 'Truth or Dare' below: