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

Republicans are outpacing Democrats in in-person early voting in Nevada while Democrats are outpacing Republicans in mail-in voting, the Nevada Secretary of State Office's latest report shows.

The latest report, updated Monday night, reflects early in-person voting and mail-in voting turnout in the first three days. It showed 52% of in-person early voters so far have been Republicans, while 28% were Democrats. Of all mail-in ballots cast so far, 43% so far have been Democrats and 30% Republicans.

The pattern reflects trends from the 2020 presidential election, when Republicans outpaced Democrats in early in-person voting and Democrats outpaced Republicans with mail-in voting.

In total, 245,356 mail-in ballots and early in-person ballots had been cast as of Monday night, with just under 40% of them being Republicans and 36% of them being Democrats.

In-person early voting in Nevada began on Oct. 19.

-ABC News' Soorin Kim

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