Election security updates: Officials brace for Election Day under cloud of threats

In an interview with ABC News Live on Monday, Martin Luther King III -- the son of Martin Luther King Jr. -- said his father would "be very proud of the message that the vice president is advocating" and "very supportive" of her campaign.

Arndrea Waters King echoed her husband's sentiment, saying it would be "a celebratory day for all of us."

"[Harris] is very clear that she will be a president for all of us," she added. "And so she's continuing to take that message every place that she goes."

The Kings also pushed back on the notion that the Black community, specifically Black men, are supporting Trump over Harris.

"There has always been this excitement around the vice president as the nominee amongst the entire Black community," Arndrea said. "The excitement is there, the numbers are there. And what we are seeing is that the exact opposite is true, that we are seeing Black men actually coming and voting and organizing and literally being on the forefront."

-ABC News' Kellymarie Braun, Kyra Phillips, Joshua B. Ascher, Adisa Hargett-Robinson and Ayanna Martinez

On the eve of Election Day, over 80 million Americans have voted early, according to the University of Florida Election Lab.

The tally includes both early in-person voting and absentee ballots.

-ABC News' Brittany Shepherd

An Orland Park, Illinois, man was arrested Sunday after he got into a violent confrontation with a poll worker, punching them in the face, according to police.

Daniel Schmidt, 24, allegedly walked into the building and passed other voters waiting in line to enter the voting area, Orland Park police said. An election judge told Schmidt to go to the back of the line and called another judge to assist, officials said. Schmidt tried to push past that election judge and was stopped from entering the voting area by the judge and other employees, according to police.

Schmidt then allegedly started yelling profanities and punched the election judge in the face, knocking their glasses off, witnesses told officers.

He also then resisted while being placed under arrest, police said.

He has been charged with two counts of aggravated battery of a victim of at least 60 years old, two counts of aggravated battery in a public place, five misdemeanor counts of resisting arrest and one misdemeanor count of disorderly conduct.

-ABC News' Tonya Simpson

Vice President Kamala Harris continued her Monday swing through Pennsylvania with a rally targeted in large part at Puerto Rican voters in Allentown, a majority-Latino city, where the Harris campaign sees an opportunity to woo voters turned off by the racist joke Tony Hinchcliffe told at former President Donald Trump’s New York rally last month.

When Mayor Matthew Tuerk mentioned Hinchcliffe's "garbage" comment, the crowd at the Muhlenberg College gymnasium booed, and at least two Puerto Rican flags were unfurled.

Rapper Fat Joe, who spoke shortly before Harris, called upon Latino voters to have "pride" and reject Trump.

"They said they needed a Puerto Rican in Allentown, and I was more than honored to come speak to my people," he said.

In her own remarks, the vice president touted her "long-standing commitment to Puerto Rico and her people."

She promised that she would be "a president for all Americans" and added that her campaign has "momentum" in the closing hours of the race.

"It is my pledge to you, if you give me a chance to fight on your behalf as president, there is nothing in the world that will stand in my way," Harris said.

-ABC News' Will McDuffie, Gabriella Abdul-Hakim and Fritz Farrow