HILLARY Clinton and Donald Trump have spent the last few hours in a blitz of America’s swing states as millions of US citizens prepare to cast their vote to choose the 45th president.

A poll of polls placed Democrat Mrs Clinton three points ahead of her Republican rival but victory or defeat will be determined in those batlleground states that change their vote from one election to another.

The former First Lady received an eleventh-hour boost when the FBI said it had found no evidence to change its July verdict that no charges should be brought over her use of a private email server while secretary of state.

In Pittsburgh, she underlined her promise to bring a divided America back together.

Mrs Clinton told reporters: “These splits, these divides that have been not only exposed but exacerbated by the campaign on the other side are ones that we really do have to bring the country together.”

Meantime, Mr Trump started his final day on the stump in the key battleground state of Florida, where there is a tussle for the large Hispanic-American vote.

The billionaire businessman, who has never run for public office, confidently declared that he would win, telling supporters in Sarasota that Mrs Clinton was “such a phony" and that "we're tired of being led by stupid people".

In Raleigh, North Carolina, he declared how his campaign was “Brexit plus, plus, plus”.

The reality TV star had planned stops in Pennsylvania and New Hampshire, closing with a late-night rally in Michigan while Mrs Clinton also took in Michigan and was due to travel to Philadelphia to be joined by President Barack Obama and singer Bruce Springsteen.

Barring recounts or legal challenges, the result is due 4am UK time on Wednesday.