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

U.S. Supreme Court Justice Samuel Alito issued an order Friday night requiring that all Pennsylvania county boards of election segregate late-arriving mail ballots, which are being challenged by Pennsylvania Republicans.

The order enforces guidance previously issued by Pennsylvania Secretary of State Kathy Boockvar, which said that "all ballots received by mail after 8 p.m. on Nov. 3 be segregated and kept 'in a secure, safe and sealed container separate from other voted ballots,'" and that "all such ballots, if counted, be counted separately," according to Alito's order.

The justice noted that neither the Republican Party of Pennsylvania nor Boockvar "has been able to verify that all boards are complying with the Secretary’s guidance, which, it is alleged, is not legally binding on them."

The justice said he is going to urge his colleagues to conference on the pending petition and asked that responses be filed no later than 2 p.m. Saturday.

The Supreme Court has twice upheld a three-day extension of the filing deadline for mail-in ballots in Pennsylvania. 

On Friday, Pennsylvania Republicans sought an emergency order from the high court mandating that late-arriving ballots not be counted. In it, they claimed that 25 out of 67 Pennsylvania counties haven't indicated whether or not they are abiding by Boockvar's guidance.

-ABC News' Devin Dwyer and Meredith Deliso

A Nevada district court judge denied an emergency injunction request by Nevada GOP groups for Clark County to stop using its signature-verification machines and to give more leeway to ballot-counting observers.

Judge James Gordon said he didn't think the plaintiffs came to the court with "sufficient evidence" to get what is required of the "extraordinary relief of an injunction" that would get him to "dictate how Clark County should do their job."

The injunctive relief directed poll workers to manually check all ballot signatures instead of using the machines. Gordon noted that halting the use of the signature-verification machines, which verify about 30% of signatures on ballots, leaving 70% to be done manually already, would significantly delay results.

"The public interest is not in favor of disrupting the processing and counting of the ballots," he said.

-ABC News' Cheyenne Haslett

In Nevada, Biden's lead has expanded to 22,657 votes following a batch of ballots from Clark County, home to Las Vegas.

Biden has 49.8% of the vote (632,558 votes) to Trump’s 48.0% (609,901 votes).

Nevada has 93% of its expected vote in.

Nevada has six electoral votes to offer.

-ABC News' Meg Cunningham and Kendall Karson

In Georgia, Biden now leads by a margin of 4,182 votes after more than 7,000 votes came in from Gwinnett County, near Atlanta.

Biden has 2,455,802 votes (49.4%) while Trump has 2,451,620 votes (49.3%).

Georgia has 16 electoral votes.

There are approximately 26,500 ballots outstanding.

"The focus for our office and for the county election officials, for now, remains on making sure that every legal vote is counted and recorded accurately," Secretary of State Brad Raffensperger said Friday.

Gabriel Sterling from the secretary of state's office said at a news conference, "We will know the final universe of numbers by today."

-ABC News' Soorin Kim and Quinn Scanlan