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Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton speak simultaneously during their first presidential debate at Hofstra University in Hempstead, New York, U.S., Sept. 26, 2016. Reuters/Rick Wilking

The second presidential debate Sunday brings a chance for Republican nominee Donald Trump to redeem himself for a dismal first effort. Most political observers thought, and were soon backed up by polls, that Democratic nominee Hillary Clinton made easy work of the GOP's presidential candidate in the first event.

The second debate brings a major shift in format, however. The first debate in September was a back and forth led along by a moderator posing questions. The second debate will take the form of a town hall led, in part, by undecided voters.

Wrote the Commission on Presidential Debates: "The second presidential debate will take the form of a town meeting, in which half of the questions will be posed directly by citizen participants and the other half will be posed by the moderator based on topics of broad public interest as reflected in social media and other sources. The candidates will have two minutes to respond and there will be an additional minute for the moderator to facilitate further discussion.

The debate is scheduled to start at 9 p.m. EDT. It's expected to run about 90 minutes through 10:30 p.m. EDT. You can find the debate on just about any major news channel imaginable, including NBC, CBS, ABC, Fox, Univision, PBS, CNBC, Fox News, CNN and C-SPAN. You can also live stream it over here at NBC's YouTube page, or watch the embedded video at the bottom of this page.

Heading into the weekend, polls had shown Clinton's lead expanding after the strong debate performance. The Real Clear Politics average of polls pegged her lead at 4.5 points nationally. Polls in swing states such as Florida and North Carolina showed Clinton ahead as well, meaning Trump could certainly use a strong debate performance.

Trump largely skipped preparation for the first debate but was doing more to get ready for the second event, according to a report Friday in the Washington Post. But the candidate known for stirring up controversies also reportedly wasn't making any promises to remain controlled during the debate. That means nobody really has any idea what will happen Sunday night.