US President Donald Trump and his the Democratic White House challenger Joe Biden have held duelling rallies in the critical election state of Florida. Mr Biden told supporters: "You hold the power. If the Florida goes blue [Democratic], it's over." Celebrating 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, a Mr Biden has solid lead nationally in opinion polls. But his advantage looks less assured in the battleground states, such as a Florida, that will decide who ultimately wins the White House.