Polling experts say Donald Trump has a much narrower path to victory than Hillary Clinton in the final hours of voting in the US presidential election.
But the race remains alive thanks to an unusually large number of undecided voters and shifting trends of support among demographic groups.
There have been very long lines at polling stations nationwide, suggesting voters have remained motivated despite having a poor opinion of this vitriolic battle.
Our Washington Correspondent Simon Marks says the major challenge for Trump in seizing a key swing state....
IN: Florida is a place...
OUT: ...battleground states.
DUR: 25"