2024 election live updates: Crowd gathers for Trump's Madison Square Garden rally

Rallying in Greenville, North Carolina, on Monday, Trump launched baseless claims about possible fraud in the 2024 election -- despite earlier in the day saying he hadn't seen evidence of it.

At one point during the rally, Trump turned to Republican National Committee Chairman Michael Whatley to ask him about election security.

"He'll stop the cheating. He's going to stop the cheating," Trump said to Whatley. "Are they cheating? Michael, they're trying, but are they? They're not going to get away with it, right? ... They got away with it in plenty of places."

Earlier in Asheville, North Carolina, Trump told his supporters that he hasn't seen any evidence of cheating in the election thus far, but added, "I know the other side and they are not good."

-ABC News' Lalee Ibssa, Kelsey Walsh and Soo Rin Kim

The office of the Georgia Secretary of State announced Monday that more than 1.5 million voters have voted early in person in Georgia as of Monday afternoon.

"Georgia voters know we've made it easy to cast a ballot. It's really that simple," Georgia Secretary of State Brad Raffensperger said in a statement.

In-person early voting started in the key battleground state on Tuesday, Oct. 15.

As of Monday afternoon, more than 15 million early votes have been cast nationally, including almost 5 million in-person early votes, according to an analysis by the Election Lab at the University of Florida.

Harris is doing a series of moderated conversations with former Wyoming Republican Rep. Liz Cheney in suburban cities in the battleground states of Pennsylvania, Michigan and Wisconsin on Monday.

While in Pennsylvania, Harris and Cheney worked to pick off Republicans disaffected with their party's nominee who may vote for the vice president and focus on the dangers Trump poses to the country and to democracy.

"There are months in the history of our country which challenge us, each of us, to really decide when we stand for those things that we talk about, including, in particular, country over party," Harris said.

Cheney, a staunch Trump critic who endorsed Harris in September despite their party and policy differences, said "every single thing in my experience and in my background has played a part" in her supporting Harris.

"In this race, we have the opportunity to vote for and support somebody you can count on. We're not always going to agree, but I know Vice President Harris will always do what she believes is right for this country. She has a sincere heart, and that's why I'm honored to be in this place."

Trump continued his alternative media outreach effort by sitting down for a podcast interview with retired pro wrestler Mark Calaway, also known as "The Undertaker."

During the podcast, Trump repeated his anti-trans rhetoric, promising to not allow "men playing in women's sports" as Calaway brought up his teenage quarterback daughter.

"You don't want to go and wrestle a guy like if you were doing that, because people do that -- like your father -- right? He's a little too much to handle," Trump said to Calaway's daughter, who was present for the interview, after Calaway asked him about Title IX..

"I will get rid of it fast. Men playing in women's sports is insane," Trump said.

Republicans have invested heavily in ads targeting the transgender community this cycle.