2024 election live updates: Trump courts Latino voters, Harris off the trail

In the final sprint of the election campaign, local officials in the key battleground state of Pennsylvania have mounted an unprecedented push to engage some of the state's newest and untested voters: 18-year-old high school seniors.

"They're the largest registered bloc of voters in the city. It's just a matter of getting them energized to come out and turn out to vote," said Philadelphia City Commissioner Seth Bluestein.

Fewer than half of 18- and 19-year-old voters nationwide cast ballots in the 2020 election, according to the Center for Information and Research on Learning and Engagement at Tufts University.

At Martin Luther King High School in Germantown, Pennsylvania, ABC News joined hundreds of high school seniors assembled for an outdoor field day of election-themed activities.

"I am following the political election a lot. I am into the debates, and I am watching the debates. So I do feel pretty positive about who I'm taking on voting for this year," said Jymirah Wood.

She and fellow senior Janeeiah Simmons said they also volunteered to be poll workers on Election Day.

"I'm not, like, someone who's super duper political myself," Simmons said, "but I feel like in this year with the election, it's really important because so many changes can happen depending on who wins."

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-ABC News' Devin Dwyer and Patty See

Elon Musk's America PAC said late Monday that it handed out a third $1 million check to a voter who has signed its petition backing the Constitution.

The PAC said in a post to X that the check was given to Shannon Tomei from McKees Rocks, Pennsylvania, posting a photograph of Tomei holding the check.

"Every day until Election Day, a person who signs the petition will be selected to earn $1M as a spokesperson for America PAC," it added.

ALSO SEE: Elon Musk offers voters $1M to sign PAC petition backing the Constitution, but is it legal?

Musk shared the announcement and congratulated Tomei. In other posts, he has been urging people to register to vote in Pennsylvania -- a crucial battleground state in next month's presidential election.

The first two winners were announced during a town hall in Harrisburg, Pennsylvania, over the weekend, with Musk handing over the checks to the winners on stage. It's unclear how the third check was delivered.

Musk has thrown his weight behind former President Donald Trump and the Republican Party, describing Trump as the only candidate "to preserve democracy in America."

-ABC News' Soorin Kim

After Minnesota Gov. Tim Walz campaigns in Wisconsin on Tuesday (where he'll be joined by former President Barack Obama for a rally in Madison), he'll remain out on the trail this week.

On Wednesday, Walz will speak at an evening fundraiser in Louisville, Kentucky.

On Thursday, he will spend the morning making political stops in Durham, North Carolina -- just a week after he visited the city with former President Bill Clinton. He'll then make local stops in Greenville, North Carolina, in the afternoon and hold a rally in Wilmington that night.

On Friday, Walz will campaign in Philadelphia, where he'll speak at a fundraiser in the city around noon.

-ABC News' Isabella Murray

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