Joe Biden. Photo: Chip Somodevilla/Getty Images

Former Vice President Joe Biden told a group of approximately 200 fundraiser attendees Friday night that he has received intelligence briefings warning of Russia, China and other foreign adversaries seeking to interfere in the 2020 U.S. elections.

What he's saying: "We know from before and I guarantee you I know now because now I get briefings again," Biden told the group. "The Russians are still engaged in trying to delegitimize our electoral process. Fact."

  • "China and others are engaged as well in activities that are designed for us to lose confidence in the outcome," he added.

Why it matters: Biden is leading in state and national polls against President Trump less than four months from election day. But Russian interference helped push Trump to victory in 2016, and could be a defining factor in the final stretch of the 2020 campaign season.

  • The federal government began briefing presidential campaigns and national parties on election threats from foreign adversaries in recent weeks, The Washington Post reported.

Go deeper

Trump and lawmakers react to intel alert on Russia and Iran election interference

Sen. Mark Warner and Sen. Marco Rubio (R-FL) in Washington, D.C. Photo: Chip Somodevilla/Getty Images

President Trump and lawmakers reacted to Director of National Intelligence John Ratcliffe's announcement that Iran and Russia sought to influence the U.S. election by obtaining voter registration data in an attempt to spread false information.

What they're saying: Senate Intelligence Committee Chair Marco Rubio (R-Fla.) and Vice Chair Mark Warner (D-Va.) urged Americans in a joint statement to "be cautious" ahead of the Nov. 3 election "about believing or spreading unverified, sensational claims related to votes and voting."

FBI: Russian hacking group stole data after targeting local governments

FBI Headquarters. Photo: Mark Wilson/Getty Images

Energetic Bear, a Russian state-sponsored hacking group, has stolen data from two servers after targeting state and federal government networks in the U.S. since at least September, the FBI and Cybersecurity and Infrastructure Security Agency said on Thursday.

Driving the news: Director of National Intelligence John Ratcliffe announced Wednesday that Iran and Russia had obtained voter registration information that could be used to undermine confidence in the U.S. election system.

The final debate

Trump and Biden at the first debate. Morry Gash-Pool/Getty Image

Watch for President Trump to address Joe Biden as “the big guy” or “the chairman” at tonight's debate as a way of dramatizing the Hunter Biden emails. Hunter's former business partner Tony Bobulinski is expected to be a Trump debate guest.

The big picture: Trump's advisers universally view the first debate as a catastrophe — evidenced by a sharp plunge in Trump’s public and (more convincingly for them) private polling immediately following the debate.