Voters in the US go to the polls on 5 November to elect their next president.
The election was initially a rematch of 2020 but it was upended in July when President Joe Biden ended his campaign and endorsed Vice-President Kamala Harris.
The big question now is - will America get its first woman president or a second Donald Trump term?
As election day approaches, we'll be keeping track of the polls and seeing what effect the campaign has on the race for the White House.
Who is leading national polls?
Harris has been ahead of Trump in the national polling averages since she entered the race at the end of July, as shown in the chart below with the latest figures rounded to the nearest whole number.
The two candidates went head to head in a televised debate in Pennsylvania on 10 September that just over 67 million people tuned in to watch.
A majority of national polls carried out in the week after suggested Harris's performance had helped her make some small gains, with her lead increasing from 2.5 percentage points on the day of the debate to 3.3 points just over a week later.
That marginal boost was mostly down to Trump’s numbers though. His average had been rising ahead of the debate, but it fell by half a percentage point in the week afterwards.
While these national polls are a useful guide as to how popular a candidate is across the country as a whole, they're not necessarily an accurate way to predict the result of the election.
That's because the US uses an electoral college system, in which each state is given a number of votes roughly in line with the size of its population. A total of 538 electoral college votes are up for grabs, so a candidate needs to hit 270 to win.
There are 50 states in the US but because most of them nearly always vote for the same party, in reality there are just a handful where both candidates stand a chance of winning. These are the places where the election will be won and lost and are known as battleground states or swing states.
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