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

Election officials in Arizona's Maricopa County said early Thursday morning that they have an estimated 275,000 more ballots to process and tabulate.

With 86% of the expected vote reporting, Biden continues to lead in Maricopa County -- 51.4% to Trump's 47.2%. The county is Arizona's most populous and the fourth-most populous in the United States. The county seat is Phoenix, the capital of Arizona and one of the largest cities in the country by population.

Biden also holds an edge over Trump statewide, with 1,469,341 votes against Trump's 1,400,951 -- 50.5% to 48.1%. About 86% of the expected absentee vote and 86% of the expected vote overall are in.

In the Senate race, Democratic challenger Mark Kelly still leads incumbent Republican Sen. Martha McSally 52% to 48%. Kelly is currently outpacing Biden's vote statewide at 1,504,460 votes.

-ABC News' Meg Cunningham

Protests over the election turned violent in multiple cities across the country Wednesday night.

In Portland, Oregon, a riot was declared and the National Guard was activated due to violence downtown. At least eight people have been arrested, according to the Multnomah County Sheriff's Office.

In New York City, skirmishes broke out between police and protesters in Greenwich Village. The NYPD said more than 20 people were arrested in the violence.

"We appreciate and value the importance of freedom of speech. Our top priority is and always will be safety," the department said in a tweet. "We have arrested more than 20 individuals who attempted to hijack a peaceful protest by lighting fires, throwing garbage and eggs in Manhattan."

Protesters across the country called for officials to count every vote as President Donald Trump baselessly claimed current vote counts were fraudulent and filed lawsuits in several states to challenge vote totals.

Final results from North Carolina are not expected to come in until next week, ABC News correspondent Janai Norman reported. Currently, Donald Trump is leading in the state with about 76,000 more votes than Biden with 117,000 absentee ballots outstanding.

"If you're Joe Biden that's not a whole lot to be excited about," Norman said. "He did what he was expected to do in those heavily urban areas -- Raleigh, Durham, here in Charlotte -- but he wasn't able to really run up this or the suburbs."

"This isn't even a case of seeing a slow trickle, and those numbers fluctuating, going up in the next few days," she added. "They'll remain pretty steady until the 12th [of November] at the earliest, 13th at the latest."

Michigan Secretary of State Jocelyn Benson said that the Trump campaign's claim there is not enough transparency in the ballot counting process "doesn't really line up with the facts."

"In our experience here in the state where we actually have bipartisan poll watchers, a number of other people, a lot of people with eyes on the process," she said.

"We always knew we'd be here from when the polls closed as we went through that tabulation, there would be a lot of efforts to undermine people's perceptions about the integrity of our process," Benson added. "But we've always had a lot of faith in the truth underneath our work."