Live election updates: 80 million have voted early as Trump, Harris sprint to finish

In a win for the Republican National Committee, the Georgia Supreme Court on Monday ruled that thousands of voters whose mail-in ballots were delayed will not have extra time to send them back.

The ruling from the court reversed a lower judge's ruling that had granted 3,000 voters an extension of the mail-in-ballot deadline, after Cobb County election officials admitted they missed the deadline to ship them out.

The deadline for mail-in ballots to be received in Georgia is Election Day -- but the lower judge had given those voters an extension for them to be postmarked by election day and received by Nov. 8, the same deadline for overseas ballots.

The RNC had appealed the ruling, saying it was a violation of the election code and that voters still had other ways they could vote, including in person.

The Georgia Supreme Court ordered the Cobb board to "keep separate" the absentee ballots of those voters that are received after the deadline on Election Day but before Nov. 8 "in a secure, safe, and sealed container separate from other voted ballots."

Cobb County had previously been ordered to ship out all of the delayed ballots by Nov. 1 with express shipping and overnight return envelopes.

The court also ordered the board to notify the voters by email, text or public announcement of the change.

The Cybersecurity and Infrastructure Security Agency continues to see threats towards election officials a day before Election Day, according to a top official for CISA, the cyber arm of the Department of Homeland Security.

In a call to reporters Monday, Cait Conley, who is in charge of CISA's election security portfolio, called these threats "fundamentally un-American."

CISA Director Jen Easterly said most local elections officials are in touch with law enforcement.

"We've not seen specific reporting about violence at polling places, so I certainly don't want voters to feel at all intimidated about going to voting locations," Easterly said, saying it should "really be a day of celebration."

Easterly said they "expect" disruptions throughout Election Day, and they are prepared for it. Foreign adversaries -- particularly Russia, China and Iran -- are looking to "undermine American confidence and the legitimacy of our elections and to stoke partisan discord," she said.

Before announcing the winners of Elon Musk's $1 million giveaway, America PAC employees conducted background checks on them, vetted their social media and had them sign non-disclosure agreements, Elon Musk's political adviser Chris Young testified during an ongoing hearing in Philadelphia on Monday.

The inside look at how winners were selected is at odds with how Musk himself described the "random" selection process.

"Were you surprised that he used the word 'randomly'?" Philadelphia District Attorney Larry Krasner's attorney, John Summers, asked.

"That's not the word I would have selected," Young said.

Young testified that he reviewed candidates based on the location of Musk's next rally before vetting the people who signed America PAC's petition in support of the First and Second amendments.

Former President Donald Trump is scheduled to host multiple dinners on election night at his Mar-a-Lago club -- including with his close friends, donors and club members, multiple sources familiar with the dinners told ABC News.

Trump is expected to dine with an intimate group of close friends Tuesday night, and there will be a separate Mar-a-Lago club member dinner in the ballroom. A source familiar with the dinners said there won't be any formal speeches but Trump will likely stop by to greet them all.

Earlier that day, Trump is expected to cast his vote in Palm Beach, Florida.

Several of the attendees of the dinners told ABC News that they're planning on heading over to the Palm Beach Convention Center after the dinner.