The third and final television debate – dubbed “fight night” – will take place on Wednesday night in Las Vegas.
After Donald Trump appeared to do better in the second debate than in the first, some commentators have said the third showdown will be decisive.
But Democratic nominee Hillary Clinton is leading her rival in polls going into the stand off.
Two major surveys – one by ABC News/Washington Post and one NBC News/Wall Street Journal – predict Ms Clinton will seize victory in the election by four and 11 points respectively.
What time and where does the debate start?
The debate will run from 9 to 10.30pm Eastern time on Wednesday 19 October, which is 2 to 3.30am on Thursday in Ireland. It will take place in the University of Nevada in Las Vegas.
How can I watch it?
Those in the US can watch the discussion on major television networks as well as C-SPAN.
This side of the Atlantic, Sky and the BBC are covering the event live. Online, American news outlets including NBC, PBS, FOX will live stream the debates on YouTube.
If you are not staying up late, you can watch the debate after the event on YouTube.
Who is moderating?
Fox News anchor Chris Wallace will be hosting the debate. Mr Wallace has a reputation for taking a combative approach to both Republicans and Democrats.
He has interviewed President Obama multiple times and is well known for his aggressive 2006 interview with Bill Clinton, where he repeatedly questioned him about whether he had done enough to capture Osama Bin Laden.
Mr Wallace once asked former President Ronald Reagan why he had denied Israel was involved with trading arms to Iran when he “knew that wasn’t true”.
The presenter is a staunch defender of Fox News, which is frequently criticised for not covering serious news stories and for pedalling right-wing rhetoric. But Mr Wallace has promised to lead a “fair and balanced” debate and to “ask smart questions”.
What is expected?
The debate is split into six 15-minute segments covering Mr Wallace’s choice of topics. These include immigration, entitlements and debt, the economy, foreign policy, the Supreme Court and each candidate’s fitness to serve as President.
Yet, as seen in the first two debates, the discussion is expected to deviate wildly from the topic at hand.

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