Election security updates: Voting hours extended in Pennsylvania county

The Cybersecurity and Infrastructure Security Agency (CISA) is not tracking any "national level significant incidents" on election day, according to a top CISA official.

Cait Conley, a senior advisor to the CISA Director and the official in charge of election security said in the early hours of voting, there haven't been any major incidents.

"We are tracking instances of extreme weather and other temporary infrastructure disruptions in certain areas of the country, but these are largely expected, routine and planned for events separately," she said on a call with reporters on Tuesday.

Additionally, Conley told ABC News that they are "not aware" of any foreign influence operations going on right now but they "remain incredibly vigilant and in close communication with our federal government partners in case such instances were to arise."

Monday night, the intelligence community, including CISA attributed two Russian influence operations including one in Arizona that were spreading misinformation about the election.

-ABC News' Luke Barr

The FBI is monitoring criminal threats to election workers and infrastructure from a 24/7 command post set up to ensure the election is safe and secure.

The command post, which is staffed with 80 people from more than a dozen agencies, will continue to operate for at least nine days.

"This command post is an opportunity for us to bring people together, all the different subject matter experts here in the FBI at headquarters and in the field, and we bring in our partners so the intelligence and threats that come in, and we can disseminate that information to the key partners, which is state and local officials around the United States," said Jim Barnacle, deputy assistant director of the FBI's Criminal Investigative Division.

The FBI is focused on criminal threats, such as threats to election workers, foreign malign influence, cyberthreats and acts of violence.

-ABC News' Luke Barr

As millions of Americans descend on polling locations across the country, election officials and law enforcement authorities are focused on administering a fair and safe election under a cloud of threats, online disinformation, and the potential for a grueling legal fight in the weeks ahead.

Although a typical Election Day inevitably includes some hiccups like long lines or weather-related issues, this year election workers face the additional challenge of a heightened threat environment and an onslaught of litigation concerning voting rules and ballot counting.

Even so, election officials on Monday expressed confidence in their ability to execute on Election Day. Pennsylvania Secretary of State Al Schmidt said the vote in his state would be "free, fair, safe, and secure." Georgia Secretary of State Brad Raffensperger said that "at the end of the day, it's going to be fair and fast and accurate."

And in North Carolina, Karen Brinson Bell, the executive director of the state's Board of Elections, said, "Despite all the naysayers, despite all false information and sensationalist rhetoric out there about elections, and despite a devastating hurricane, we are making this happen in North Carolina."

-Lucien Bruggeman

Former President Donald Trump used his final campaign rally in Grand Rapids, Michigan, to attack high profile Democrats including President Joe Biden and former Speaker of the House Nancy Pelosi.

Trump told attendees he is "not running" solely against Vice President Kamala Harris. "I'm running against an evil Democrat system," he said. "These are evil people."

Trump launched into attacks on Biden, pushing unfounded claims that Harris only became the nominee because Democrats wanted to be "politically correct."

Trump then made fun of Harris's name calling it "a strange name," before pivoting back to criticize Biden.

"I wasn't running against Biden either," Trump said. "He was stuck in a basement. I didn't even run against him. Now running against a very evil system, and we have to defeat that system, and America's future will be an absolutely incredible one."

The former president also mouthed an expletive when referring to Pelosi. "She's a crooked person," he added. "She's a bad person, evil."

-ABC News' Lalee Ibssa, Soo Rin Kim and Kelsey Walsh