Twelve of the GOP presidential candidates will enter the next round of debates in the Midwest with Tuesday's event in Milwaukee.
The focus of the debate is on jobs, taxes and the health of the economy as well as domestic and international policy issues, but the latest scandals in the candidates' campaigns will also likely crop up.
With his recent surge ahead of Trump in some polls, Dr. Ben Carson will probably face some tough questions from his contemporaries and the moderators about his biography and accusations that he lied about it, although Carson himself believes it's time to move on from those questions.
The main debate will feature the top eight candidates, and the earlier debate will feature four more of the lower polling candidates.
On the main stage will be:
In the earlier debate will be:
Republicans Lindsey Graham, George Pataki and Jim Gilmore did not make the cut for either debate.
The debate is hosted by Fox Business Network and the Wall Street Journal. The first debate will begin at 6 p.m. CST and the main debate starts at 8 p.m. Both events at the Milwaukee Theatre are sold out.
The debates will be broadcast on Fox Business Network and will also be available via streaming on foxbusiness.com without a cable subscription.
Trish Regan, Sandra Smith and Gerald Seib will moderate the first debate, and Neil Cavuto, Maria Bartiromo and Gerard Baker will moderate the primetime debate.
Ahead of the debate, several candidates campaigned in the Midwest, including Donald Trump who headlined a rally in Springfield Monday night.
Ohio Gov. John Kasich spent Monday night in Chicago at an event at the Billy Goat Tavern from 4 p.m. to 6 p.m., and Rick Santorum made his way to the Windy City Tuesday morning to speak about American manufacturing.
Florida Sen. Marco Rubio and former Florida Gov. Jeb Bush were both scheduled to attend campaign events in Wisconsin on Monday, but not in Milwaukee. Rubio rallied with supporters in Pewaukee, and Bush was set to appear at an event in Waukesha with Gov. Scott Walker, who dropped out of the presidential race in September.