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The town hall comes as Hillary Clinton and Bernie Sanders are neck and neck in the polls.
The three Democratic candidates will have a chance to appear before Iowa voters a week before the state's caucuses.
Members of the country's largest LGBT group applauded Clinton for her ongoing efforts to advance their cause.
The announcement came amid speculation that the former Maryland governor might not secure a spot on stage.
The South Carolina governor confirmed she was referencing Trump as one of the "angriest voices" during her GOP response.
Haley encouraged Republicans to recognize their contributions to the "erosion of the public trust."
Despite a few dust-ups over ISIS and Wall Street, there's much more consensus among Democrats than Republicans.
Sanders and the Democratic National Committee agreed to restore voter file data to the Sanders campaign.
The three Democratic candidates will face off in New Hampshire on Saturday at 8 p.m. ET.
Many rank-and-file union members remain drawn to Sanders.
The Democratic presidential front-runner urged Americans not to give up hope that the gun lobby can be defeated.
Leaders of both parties have failed to step up to the challenge of the slaughter of Syrians.
The conversation during the first 30 minutes of the two-hour debate was focused on ISIS and the Middle East.
He's trailing in the polls and low on money, but when he rolls up his sleeves and pulls out his guitar you see the leader he could be.
Democratic candidates Hillary Clinton, Bernie Sanders and Martin O'Malley will face off in Iowa at 9 p.m. ET.
Carson's remarks came after the real estate mogul went on a lengthy rant about him.
The Democratic front-runner has locked up support from 359 superdelegates.
The Democratic presidential candidate wants to overturn a 2005 law that grants immunity to gun dealers and manufacturers.
He said he was forced out of the race because he didn't score high enough in polls to earn a spot in the debates.