Joe Biden leads President Trump 48% to 42% in Wisconsin and 49% to 43% in Pennsylvania, according to the latest CBS/YouGov Battleground Tracker poll.

Why it matters: Trump's surprise wins in the two states, where many voters broke his way after deciding the week before the election, helped propel him to an Electoral College victory over Hillary Clinton. Trump won Wisconsin with 47% of the vote and Pennsylvania with 48% in 2016, according to the New York Times.

Sen. Richard Blumenthal (D- Conn.) called on the Trump administration to declassify intelligence detailing Russian efforts to influence the 2020 elections, telling MSNBC on Sunday that the classified briefing lawmakers received about the Kremlin's activities last week was "absolutely chilling."

The big picture: National Counterintelligence and Security Center Director William Evanina said in a statement Friday that the Russian government is "using a range of measures" to "denigrate" Joe Biden ahead of the election. China and Iran would prefer that Trump is defeated, according to Evanina.

House Speaker Nancy Pelosi said on CNN's "State of the Union" Sunday that the threats posed by China and Russia to U.S. elections are "not equivalent," stressing that "Russia is actively, 24/7, interfering in our election."

Why it matters: Top counterintelligence official William Evanina revealed in a statement on Friday that the Russian government is "using a range of measures" to "denigrate" Joe Biden ahead of the election. The government of China, meanwhile, prefers that Trump does not win re-election, Evanina said.

Ukraine's President Volodymyr Zelensky issued a statement on his Facebook page Saturday stating that it "is never and under no circumstances acceptable to interfere with another country's sovereign elections."

Why it matters: National Counterintelligence and Security Center Director William Evanina said Friday the Russian government had taken action to "denigrate former Vice President Biden" before November's election and that a "pro-Russia" Ukrainian lawmaker was "spreading claims about corruption" to "undermine" the presumptive Democratic presidential nominee.

Postmaster General Louis DeJoy announced a reorganization of the U.S. Postal Service's leadership on Friday, shifting top personnel and pushing structural changes, according to the Washington Post.

Why it matters: The restructure, which reassigns or displaces postal executives, including two officials who oversee day-to-day operations, comes amid increased scrutiny from Democratic lawmakers, who fear that DeJoy's changes could threaten the use of mail-in ballots for the November election.

Sen. Elizabeth Warren and Hillary Clinton both are slated to speak on the Wednesday of the Democratic convention — Aug. 19 — four sources familiar with the planning told Axios.

Why it matters: That's the same night Joe Biden's running mate (to be revealed next week) will address the nation. Clinton and Warren represent two of the most influential wise-women of Democratic politics with the potential to turn out millions of establishment and progressive voters in November.

National Counterintelligence and Security Center Director William Evanina said Friday that the Russian government is "using a range of measures" to "denigrate former Vice President Biden" before the November election.

Why it matters: Evanina warned that some Kremlin-linked actors are trying to support President Trump’s candidacy on social media and Russian television, while others are spreading false claims about corruption to undermine Biden and the Democratic Party.

Anthony Fauci declined to tell the Washington Post on Friday if mail-in voting should be used as a public health measure amid the coronavirus pandemic, saying his statement would "almost certainly ... be used as a soundbite."

Why it matters: Fauci said he didn't want the media to set up another confrontation between him and President Trump, but it highlights how government medical experts have often found themselves in politically contentious situations when dealing with issues like reopening schools, mask mandates or the upcoming election.

Looking ahead to Joe Biden's announcement of a female running mate, a group of women leaders sent a letter Friday to top news executives to warn them against "stereotypes and tropes" in coverage.

What they're saying: "Our country — and your newsrooms — have learned a lot since the killing of George Floyd and the subsequent protests for racial equality that his death spurred," the letter says.

After two gaffes and a low blow from President Trump questioning his faith, Joe Biden spent Thursday evening off his own message — clarifying comments and responding to attacks.

Why it matters: Biden’s responses reflect what we could see a lot more of in the next few months — cringeworthy comments and Trump smears, smacking into each other and pulling the Democrat off course.