Teen allegedly assaulted at Trump rally

Donald Trump (AAP)
Donald Trump (AAP)

Police are investigating claims a teenager was sexually assaulted and attacked with pepper spray at a Donald Trump rally in Wisconsin.

Video shows a young woman, believed to a protester aged about 15, in heated discussion with Trump supporters. She is heard accusing a grey-haired man of groping her, saying, "you f**king touched me".

He shakes his head, and after she tries to push him away -- or punch him, it's not entirely clear -- someone sprays an orange substance directly in her face from point-blank range.

Mr Trump's supporters cheer, and a man wearing a 'Make America Great Again' hat shouts, "Get out of here, you goddamn communist n****r-lover!"

She was taken to hospital and later released.

The greying man, named by the Wisconsin State Journal as Dan Crandall, said he didn't touch the young woman.

The Janesville Police Department has issued a plea for public help in finding two men -- the man who allegedly groped her, and the man who used the pepper spray.

A photo was released of the latter suspect -- a bespectacled young man wearing a 'Make America Great Again' hat.

Teen allegedly assaulted at Trump rally

It's not the first Trump rally which has descended into violence. On March 9, one of his supporters sucker-punched a protester, and threatened to kill him if they meet again. Rather than disown his supporter's actions, Mr Trump offered to pay his legal fees.

The latest incident occurred the day after Mr Trump's campaign manager was charged with battery after grabbing a reporter and allegedly bruising her arm.