The next Republican debate, slated for Tuesday night in Milwaukee, can be watched via live stream, unlike the previous debate. Above, Republican U.S. presidential candidates Florida Sen. Marco Rubio, businessman Donald Trump and Dr. Ben Carson applaud before the start of the CNBC-hosted debate held in Boulder, Colorado, Oct. 28, 2015. Reuters/Rick Wilking

The fourth Republican presidential debate, hosted by Fox Business Network and the Wall Street Journal, is slated for Tuesday night in the Milwaukee Theater in Wisconsin. Here's how to watch the candidates duke it out via live stream on your computer, as well as other key information include candidates, ratings and topics for debate.

The first debate of Tuesday night, featuring undercard candidates, is expected to include New Jersey Gov. Chris Christie, former Arkansas Gov. Mike Huckabee, Louisiana Gov. Bobby Jindal and former Pennsylvania Sen. Rick Santorum. It has been scheduled to begin at 7 p.m. EST and is expected to last one hour.

The stage for the prime-time debate, expected to start at 9 p.m. EST and last for two hours, should include former Florida Gov. Jeb Bush, retired neurosurgeon Ben Carson, Texas Sen. Ted Cruz, former Hewlett-Packard CEO Carly Fiorina, Ohio Gov. John Kasich, Kentucky Sen. Rand Paul, Florida Sen. Marco Rubio and business mogul Donald Trump.

To watch the live stream, click here. You'll be redirected to FoxBusiness.com, where the live stream is available.

Topics in the debate are expected to include the economy, jobs and taxes as well as policy issues, both foreign and domestic, Fox News reported. As of Sunday, Trump was leading national polls with 25.3 percent support, followed by Carson with 24.5 percent, Rubio with 11.8 percent and Ted Cruz with 10 percent. In order to appear in the undercard debate, candidates had to receive less than 1 percent support in polls.

The first Republican debate was held Aug. 6 in Cleveland, the second Sept. 16 in Simi Valley, California, and the third Oct. 28 in Boulder, Colorado. CNBC, which hosted the most recent debate, was criticized for failing to stream it live for free, offering a live stream only to those with cable subscriptions.