Last Clinton-Trump debate: what you need to know

Democrat Hillary Clinton and Republican Donald Trump debate for the third and final time on midday Thursday Australian time, 20 days before Election Day.

Republican U.S. presidential nominee Trump listens as Democratic nominee Clinton answers a question from the audience Source: X00301

Here's what you need to know about the big night in US politics:

When and where

Wednesday. 6pm (Thursday 12pm AEDT), at the University of Nevada, Las Vegas.

Duration: 90 minutes

Format

The two candidates will each be standing at a lectern, as they were in the first debate.

There will be no commercial breaks in the broadcast.

Where to watch

You can watch the debate live on SBS at 12pm (AEDT) and live streamed here. 

Most major US networks will carry the debate on their channels and websites (main networks ABC, NBC, CBS, Fox and PBS; cable networks CNN, C-SPAN, Fox News, Telemundo; and websites such as Facebook, Hulu, Huffington Post, Politico, Twitter and Yahoo).

Themes

The debate will be divided in 15-minute segments, dedicated to the following themes: debt and entitlements; immigration; economy; Supreme Court; foreign hot spots; and fitness to be president.

Moderator

Chris Wallace, a 69-year-old veteran political reporter for Fox News, the most watched news network in the United States. He's expected to be tough on both candidates.

Ratings to beat

First debate on September 26: a record 84 million television viewers, according to Nielsen.

Second debate on October 9: 66.5 million viewers