Gregory Timm, 27, has been arrested and charged with two counts of aggravated assault on a person aged 65 or older, and with criminal mischief and driving with a suspended licence.

One of the volunteers, Mark Alfieri, told WCAX3: "Out of the blue, a man approached us in a van, was waving at us, kind of a friendly demeanour, thought he was coming up to talk to us.

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Trump was welcomed to the UK by the Queen and a state banquet was held at Buckingham Palace in his honour

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Donald Trump and Nigel Farage pose in the golden elevator at Trump Tower on 12 November 2016. Farage was the first British politician to meet with Trump after the election

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On 16 June 2015, Trump announced that he would run for the presidency of the United States in the 2016 election as a Republican

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Trump considered running in the 2012 election, where he would have faced Barack Obama. He is speaking here at an event for a Republican women's group

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Trump styles his 'You're fired!' pose in his Trump Tower office in June 2012. At the time he was known as a reality TV star on The Apprentice

Mr Alfieri said the driver then stopped the van, got out and started filming the scene, before making an obscene gesture and driving off.

"Thankfully no one was injured but certainly they are shaken after being targeted because they were registering voters."

The local Democratic Party condemned the attack, saying: "No one's life should be placed in danger for exercising their first amendment rights. As Democrats, but more importantly, as residents of this great city of Jacksonville, we call on our fellow citizens to act with dignity, civility and respect for one another during this election cycle and beyond."