Elon Musk jumped wildly with his fists in air as he joined Donald Trump on stage for the first time.

The dramatic appearance by the Tesla and SpaceX boss came as Trump returned to the Butler Farm Show grounds in Pennsylvania, where he survived an attempted assassination three months ago.

After leaping up and down, Musk told the huge crowd: 'America is the home of the brave and the true test of someone’s character is how they behave under fire.

'We had one president who couldn’t climb a flight of stairs and another who was fist-pumping after getting shot! FIGHT, FIGHT, FIGHT!

Musk, wearing a black baseball hat, urged supporters to vote, and register to vote, and to get others to 'vote right now'.

'I'm being repetitive for a reason,' he said. 'Honestly you want to be a pest. Fight, fight, fight! Vote, vote, vote!'

Musk's appearance at Trump's rally in Butler was the first time he has taken the stage at a political rally.

The billionaire was inspired to endorse Trump publicly after the failed assassination attempt of the former president at Butler on July 13.

As the two men were on stage Trump praised Musk for donating Starlink systems to victims of hurricane Helene, joking he did not understand what the space satellite internet system was.

'I didn't know what the hell Starlink was,' Trump admitted.

The crowds shouted 'Elon! Elon! Elon!' In response

Before Musk's arrival Trump paid tribute to Corey Comperatore, the man who was shot and killed when gunman Thomas Crooks opened fire on July 13..

After Trump called for a moment of silence, opera singer Christopher Macchio sang 'Ave Maria' and a bell rung at the same time that gunfire began three months ago.

The widow of Comperatore and their children also returned to the rally, seated with members of the Trump family.

Trump also paid tribute to two other men who were injured in the attack.

One had returned to the rally, Trump revealed, but one was in the hospital being treated.

At one point, the former president had to pause the rally after a woman fainted.

Supporter shouted 'We love Trump!' and sang the National Anthem for about four minutes as she was attended to.

Although the temperature in Butler is only in the high 60s, rallygoers have frequently collapsed at political rallies due to heatstroke this election season.

Earlier, as Trump took the stage he said: 'A very big thank you, we love Pennsylvania. And, as I was saying...'

He had displayed on two big screens a chart on immigration that was there when he was shot.

Trump said: 'I return to Butler to deliver a simple message. We are going to make America great again, we are going to win the election. And to all Americans, together, in just one month we are going to usher in a new golden age.

He added: 'For 16 seconds, time stopped as this vicious monster unleashed pure evil. That villain did not succeed.'