The remaining Republican candidates running for president are gathering for the first debate of 2016 on Fox Business - find out how to watch it online.

FOX Business Network is hosting the sixth Republican debate of the election season in North Charleston, S.C. tonight. Anchors Neil Cavuto and Maria Bartiromo will moderate the debate, which is being held at the North Charleston Coliseum and Performing Arts Center.

Like previous debates, this one will be split into two tiers. The undercard debate, designed for the less popular candidates in the race, begins at 6 p.m. ET, and features Carly Fiorina, former Gov. Mike Huckabee and former Sen. Rick Santorum.

Rand Paul was slated for the undercard debate but has decided to skip it.

"By any reasonable criteria, Senator Paul has a top tier campaign," Paul's campaign said in a statement this week. "He will not let the media decide the tiers of this race and will instead take his message directly to the voters of New Hampshire and Iowa."

Meanwhile, the primetime debate begins at 9 p.m. ET and includes Donald Trump, Sen. Ted Cruz, Sen. Marco Rubio, Ben Carson, former Gov. Jeb Bush, Gov. Chris Christie and Gov. John Kasich.

You can watch FOX Business starting at 6 p.m. ET for coverage of the debate. Check your local listings to find the channel in your area.

Watch 2016 Republican Debate Live Online Or Via Mobile Devices

But what if you're not near a TV and want to watch the debate madness online? There's an official, legal option for you. FoxBusiness.com is live streaming the debate.

Keep Up With The 2016 Republican Debate On Social Media

Want to keep up with the Republican debate live? Use hashtag #GOPDebate on Twitter.

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GOP debate, Live stream, Live streaming