Election 2020 updates: Biden warns of 'dark winter,' pushes masks in pandemic plan

In an update to the Cybersecurity and Infrastructure Security Agency Rumor Control page, the agency assured Americans that there are robust safeguards in place to ensure accuracy of election results. 

“The systems and processes used by election officials to tabulate votes and certify official results are protected by various safeguards that help ensure the accuracy of election results,” the agency, a branch of the Department of Homeland Security, said.

It continued: “These safeguards include measures that help ensure tabulation systems function as intended, protect against malicious software, and enable the identification and correction of any irregularities.”

Trump has tweeted his first reaction to Biden's apparent win to be the next president of the United States, falsely claiming in an all-caps tweet that he won the election.

He also pushed the unfounded claim that observers weren't allowed in to watch ballots be counted, which is not true.

Biden is leading Georgia by 7,547 votes, which is is well within the margin needed for a candidate to request a recount. The margin must be less than 0.5% of total votes cast in the race, and with the vote that has been reported, the margin would need to be fewer than 24,895 votes. 

There are no automatic/mandatory recounts in Georgia.

A recount cannot be officially requested until the results are certified. The deadline for the state to certify the election is Nov. 20.

-ABC News' Quinn Scanlan

Marjorie Taylor Green, who won Georgia's conservative 14th Congressional District this week after publicly supporting the fringe conspiracy theory known as QAnon, was joined by dozens of Trump supporters at the Georgia State Capitol Saturday.

She baselessly claimed the election was stolen as she addressed the crowd, saying, “what we are seeing now is an election being stolen, and I’m not going to stand for it.” 

In Arizona, several hundred Trump supporters, many of whom were armed, gathered outside the state capitol in Phoenix, where they waved Trump flags and shouted "USA," and "four more years!"

Outside the Pennsylvania State Capitol in Harrisburg, police kept Trump and Biden supporters, who were yelling at each other, separate.

-ABC News' Elwyn Lopez and Zohreen Shah