Election security updates: More non-credible bomb threats sent to Atlanta area

For her second rally of the day, Vice President Kamala Harris addressed a crowd of about 15,000 against the backdrop of an old steel mill in Pittsburgh, Pennsylvania. Accompanied by Katy Perry’s power vocals, Harris encouraged supporters to utilize their hard-earned momentum to cross the finish line.

“Pittsburgh, this is it. Tomorrow is Election Day. Tomorrow is Election Day, and the momentum is on our side," she said. "Our campaign has tapped into the ambitions, the aspirations and the dreams of the American people, and we know it is time for a new generation of leadership in America, and I am ready to offer that leadership as the next president of the United States.”

She urged the crowd to “turn the page” to chants of “We’re not going back.”

“And we have an opportunity in this election to finally turn the page on a decade of politics driven by fear and division. We are done with that," she said. "We're done. We're done. We're exhausted with it, and Pittsburgh, we are not going back. We're not going back.”

She continued: “Ours is not a fight against something. It is a fight for something. It is a fight for the future, and it is a fight for freedom, like the fundamental freedom of a woman to make decisions about her own life and not let the government tell her what to do.”

Harris’ fairly brief speech was nearly line-for-line the same as her one in Allentown, Pennsylvania, earlier in the day. Her campaign has said that the speeches are being timed ahead of her next and final stop in Philadelphia.

Harris continued to avoid directly using former President Trump’s name, barely referring to him at all except to acknowledge that voters are ready for a president who doesn’t stew over an “enemies list.”

“We are ready for a president who knows the true measure of a leader is not based on who you beat down, it is based on who you lift up," she said. "And instead of stewing over an enemies list, I will spend every day working on my to-do list. All full of priorities to improve your life.”

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

In his "closing message" in Pennsylvania, just a day before the 2024 election, former President Donald Trump touted his relationship with Robert F. Kennedy Jr.

Trump called the former independent presidential candidate "a credible guy" and said he’s going to be very involved in his administration.

"Bobby Kennedy, you know, he's a credible guy... He's going to be very much involved. You know, he's got a tremendous view on health and pesticides and all this stuff. And we're not really a healthy country," Trump said.

Then Trump said he would allow RFK Jr. "to pretty much do what he wants."

"Bobby's going to pretty much do what he wants. I want him to do something really important for our country, make people healthier," Trump said.

RFK Jr. previously said he would oversee public health agencies in Trump's administration including the Department of Health and Human Services and the Department of Agriculture.

In a Spanish-language radio interview released Monday, Vice President Kamala Harris again vocalized her support for Puerto Rico.

“My commitment to Puerto Rico is longstanding. Even when I was in the United States Senate as representative of California, I took on a responsibility for myself of also prioritizing the needs of Puerto Rico, because I was aware that Puerto Rico did not have a U.S. senator, and so I was responsible for getting more resources to Puerto Rico," she said in an interview on Univision Radio.

She vowed to continue honoring that commitment "when I am elected president of the United States, God willing, and with the votes of the people listening right now."

She positioned her inclusive approach as a stark contrast to former President Donald Trump's language in recent weeks, which she called "hateful."

“Trump’s comments are hateful [and] are, you know, just furtherance of these tropes that are really unfair and meant to divide and demean people,” she said, citing what Jennifer Lopez said onstage while campaigning for Harris last week.

Harris also called immigration reform “one of [her] highest priorities.”

“The immigration system is just broken,” she said, listing a few of her approaches to fixing it, including securing the border, hiring more asylum judges, creating more humane asylum processes and creating a pathway for "hard-working people" to earn citizenship.

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

Sen. JD Vance delivered his closing message to the voters of Newtown, Pennsylvania, on Monday, advocating for former President Donald Trump to be elected back to the White House.

Vance told the crowd that the only way the country would get a person who is fit to be president is by voting for Trump.

"So tomorrow, we're going to say to Kamala Harris, you are fired. We don't want you in the White House. We don't want you in the Oval Office, we don't want you anywhere near the halls of power," the vice presidential candidate said.

Vance again brought up the recent "garbage" comment controversy, falsely claiming Harris called Trump supporters "garbage."

“So, to Kamala Harris, you shouldn't be calling your citizens garbage. You shouldn't be criticizing people for daring to criticize you for doing a bad job. And our message to the leadership, to the elites of the Democratic Party -- the people of Pennsylvania are not garbage for struggling under your leadership. But tomorrow, the people of Pennsylvania are going to take out the trash in Washington, D.C., and we're going to do it together," Vance said.