President Donald Trump and Democratic presidential nominee Joe Biden meet Thursday at Belmont University in Nashville, Tennessee, in the final debate of the 2020 campaign. In a big change from past debates, the showdown will include new rules and a mute button.

According to the Associated Press, plexiglass dividers were removed hours before the debate and it is unclear why.

This is the second and final debate between Trump and Biden 

The first debate was seen by over 73 million viewers and included Trump engaging in many heated exchanges with Biden and the moderator -- a tactic that appeared to have hurt him in subsequent polling. The Washington Post reported that Trump interrupted either the moderator or Biden 71 times, compared to 22 interruptions by Biden.

Both Biden and Trump were scheduled to have a third debate. However, that was abruptly canceled after Trump tested positive for COVID-19 and refused to participate in a virtual event.  

Biden leads in the polls

Biden holds a 10-point lead among likely voters, according to a Quinnipiac University poll released Thursday.  Among likely voters who are voting by mail or absentee ballot, 69% say they are supporting Biden while only 21% said they are supporting Trump. Similarly, likely voters who plan to cast an early ballot in-person support Biden 57% to Trump’s 35%. Conversely, 65% of likely voters who plan to vote in-person on Election Day will be voting for Trump, according to the poll.

Kristen Welker is the moderator 

Welker, a Harvard graduate, is a longtime NBC News reporter. Because of the change in format, Welker can have a better shot at maintaining order than Fox News host Chris Wallace. The first debate had frequent interruptions and bickering between Trump and Wallace. 

Six Topics

There are six topics that will be debated: fighting COVID-19, American families, race in America, climate change, national security and leadership.

Stepien, Trump's campaign manager, sent the debate commission a letter on Monday slamming it for not including a section on foreign policy, which the campaign sees as a weak point for Biden, despite Biden previously chairing the Senate Foreign Relations Committee. Stepien asked the commission to "rethink and reissue a set of topics" for the debate, with an emphasis on foreign policy.

The debate is divided into six 15-minute segments 

Each candidate will have two minutes of uninterrupted time at the beginning of each segment. Unlike the first debate, candidates' microphones will be muted during the first two minutes of each segment to let Biden and Trump speak uninterrupted.