Anti-Trump protester PEPPER SPRAYED by one of The Donald's angry supporters

A young girl was pictured getting pepper sprayed directly in the face while protesting outside a Donald Trump rally in Wisconsin, say witnesses.

The event in Janesville was attended by thousands of pro-Trump supporters Tuesday - but things got heated during an altercation between a man and a teenage girl, who was protesting.

Shocking pictures show the teen - identified only as Alex - getting blasted by pepper spray that is held just inches from her face.

A video shows the young girl - who has short blonde hair and glasses - shouting something at a man who is out of shot, after which she appears to reach out and try to push him.

But within seconds a hand is seen reaching into frame and she is pepper sprayed. The girl's face gets covered in the orange spray and she staggers away, wiping her face as she goes.

The fifteen-year-old was there to protest Trump and began arguing with a man who supported the Republican candidate.

Janesville Police Chief David Moore told Wisconsin State Joual the girl was sprayed by a man standing with 19-year-old woman from Madison, who also was struck by the spray.

Both received medical attention at local hospitals, say police.

The girl claimed that the man who she appears to take a swing at had groped her.

 Dan Crandall of Milton - who says he was punched by the girl (right) - said she got upset after people shouted at her: 'All lives matter'. The girl - known as Alex - says he groped her, but he denies this 

But Dan Crandall of Milton - who says he was punched by the girl - has denied this allegation.

In a video filmed after the incident, Crandall said the she had been shouting 'black lives matter', while a lot of people around her were shouting 'white lives matter', and she apparently got upset 

He said: 'She challenged me, saying 'why are you at a Trump rally if you are a grown man' and I replied that that was exactly why I was at a Trump rally - because I am a grown man and I want to make this country great again.'

He added that the supporters had been 'waed not to make contact with protesters'.

About 1,000 people were allowed inside the conference center to listen to Trump speak while another 1,000 remained outside, said the Joual. 

Crandall then claimed that the girl starting 'screaming in his face' and as the crowd around her got more heated, she swung a punch at him, he says.

'Shortly after that a man standing behind me got her with pepper spray', he said.

The Republican candidate - who has been accused of inciting violence at his rallies - was in the swing state for a town hall event Tuesday evening, ahead of Wisconsin primary voters taking to the polls next week.