US President Donald Trump and his Democratic White House challenger Joe Biden have held duelling rallies in a critical election state of Florida.

Mr Biden told a supporters: "You hold power. If Florida goes blue [Democratic], it's over."

Celebrating the soaring economic figures, Mr Trump, a Republican, said of his rival: "He's going to lock you down."

With just five days to go until election day, Mr Biden has a solid lead nationally in opinion polls.

But his advantage looks less assured in the battleground states, such as Florida, that will decide who ultimately wins the White House.