Since the first presidential debate of this election cycle, a lot has happened between the two candidates pining for their seat in the Oval Office.
With Donald Trump battling sexual assault allegations and Hillary Clinton facing new troubles regarding her emails and WikiLeaks, this election cycle is unlike anyone has ever seen — or expected.
Here's the need to know on each presidential candidate leading into the third and last presidential debate, with 19 days until Election Day 2016.
With Clinton about 6 points ahead of Trump nationally, according to a recent poll by NBC news, the gap between the two is slowly widening, as it did shortly after the two were nominated as their parties' candidates.
Hillary Clinton and her unwavering relationship with emails
WikiLeaks has been on the forefront of revealing and releasing emails in regard to Clinton, and more recently, apparent emails from the personal email account of Clinton's campaign chairman John Podesta.
According to WikiLeaks, it will release a new batch of emails every day leading up to Election Day 2016, and those emails iinclude information such as what to do with foreign government lobbyist donations, transcripts of Clinton's Goldman Sachs paid speeches, among other things.
Clinton's campaign has neither confirmed nor denied the legitimacy of the emails as to how accurate or true they are, and some Clinton aids are saying that the emails have been "doctored."
Another controversy surrounding Clinton and emails dates back to her relationship with her private email server, where over the summer, FBI Director James Comey recommended that no charges should be made against Clinton in the email case that involved her sending about 30,000 emails on the server while she was Secretary of State.
But it was released Monday that a top State Department official allegedly pressured the FBI to downgrade the classification of one of Clinton's emails as part of "quid pro quo" deal.
According to the documents released by the bureau and reported by Politico, the reason for the downgrade was an exchange for more FBI agents in different countries.
Donald Trump on sexual assault and harassment allegations
Since the hot microphone audio and video of Trump making lewd comments toward women surfaced about two weeks ago, several women have said that the presidential candidate sexually assaulted or harassed them.
Trump has been negating the allegations against him vehemently, brushing off his lewd comments as "locker room talk" and even referring to himself as a "victim" while at a rally in Charlotte, North Carolina, on Friday.
Melania Trump on Tuesday told Fox News that the allegations against Trump are "unfair," insisting on his innocence.
The two candidates will square off at 8 p.m. Central Time on Wednesday at the University of Nevada in Las Vegas. Fox News anchor Chris Wallace will moderate the debate in six 15-minute segments covering topics picked by Wallace.
The topics include immigration, entitlements and debt, the Supreme Court, the economy, foreign policy and each candidate's fitness to serve as president.