Donald Trump and Hillary Clinton square off Sunday night for their second presidential debate, at Washington University in St. Louis. 

Here's how to watch: 

TV

Tune in at 9 p.m. ET on Fox News Channel, Fox Business Network or the Fox Broadcast Network.

Streaming online

The debate will be streamed on FoxNews.comFoxBusiness.com, the Fox News app, YouTube, Roku and Facebook. Comments from Fox News personalities will appear live on the lower section of the FoxNews.com video stream.

Social media -- #FoxNews2016

Get instant reaction from Fox News hosts and contributors as they comment live during the debate. See all the action unfold on FoxNews.com and Facebook.com/FoxNews. And take part in the social media conversation using the hashtag #FoxNews2016.