The U.S. Postal Service alerted 46 states and Washington, D.C., that it cannot ensure ballots sent by mail in the general election will arrive in time to be counted, the Washington Post reported Friday.

Why it matters: The written warnings, issued at the end of July, indicate that USPS believes it may not be able to manage the sudden surge in mail-in voting due to the coronavirus, "adding another layer of uncertainty ahead of the high-stakes presidential contest," the Post writes.

Democratic leaders Chuck Schumer and Nancy Pelosi accused President Trump on Friday of using "sabotage tactics" in his latest attacks on the U.S. Postal Service and mail-in voting, and threatening the integrity of the 2020 election, they wrote in a letter.

The big picture: Trump this week vowed to block additional funding for the USPS in the next coronavirus stimulus package, linking the agency to his baseless claims that increased mail-in voting will lead to widespread voter fraud.

New Jersey Gov. Phil Murphy (D) told CNN on Friday that the state will conduct its general election mostly by mail as the coronavirus pandemic persists.

Why it matters: Murphy's announcement comes as President Trump has spent the last several months attacking mail-in voting as a practice he claims — without strong evidence — is susceptible to voter fraud.

In her first sit-down interview since being named Joe Biden's running mate, Sen. Kamala Harris talked about what she'll do to fight for women if elected VP, and how the Democrats are thinking about voter turnout strategies ahead of November.

What they're saying: "In a Biden-Harris administration women are going to be a priority, understanding that women have many priorities and all of them must be acknowledged," Harris told The 19th*'s Errin Haines-Whack.

The National Association of Letter Carriers, the union representing roughly 300,000 current and former postal workers, on Friday endorsed Joe Biden in the 2020 presidential election, calling him "a fierce ally and defender of the U.S. Postal Service," reports NBC News.

Why it matters: The endorsement comes as President Trump has vowed to block additional funding for the USPS in the next coronavirus stimulus package, linking it to his continued baseless claims that increased mail-in voting will lead to widespread voter fraud.

Joe Biden and Sen. Kamala Harris on Friday signed the required documents to receive the Democratic nomination for president and vice president at next week's convention.

Why it matters: The pair is officially one step closer to becoming the ticket to take on President Trump and Vice President Pence.

Former President Barack Obama tweeted Friday that everyday Americans could become "collateral damage" if President Trump continues to attempt to slash funding for the U.S. Postal Service as part of his campaign against mail-in voting.

Why it matters: Trump linked his baseless claims that increased mail-in voting will lead to widespread voter fraud on Thursday to the current impasse in coronavirus stimulus negotiations.

White House senior adviser Jared Kushner told "CBS This Morning" on Friday that he does not believe President Trump promoted a baseless claim that Sen. Kamala Harris is ineligible to be vice president.

Driving the news: During a press briefing on Thursday, Trump did not question the veracity of a Newsweek op-ed that inaccurately claimed Harris may be ineligible for the office due to her parents' naturalization status at the time of her birth. Harris is an American citizen and was born in Oakland, Calif.

Climate isn't top of mind for the electorate in the 2020 presidential race, but Pew Research Center polling also signals how the topic is likely to surface in the months ahead.

Why it matters: Joe Biden has tethered his proposed low-carbon energy and infrastructure investments to his wider economic recovery message.

Dodger Stadium will become a voting center in November, with more teams expected to make dormant arenas and stadiums available soon, AP reports.

How it works: Any registered voter in Los Angeles County will be able to visit the stadium over a five-day period. Parking will be free.