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

Attorney Hillary Scholten, the Democrat running in Michigan's 3rd Congressional District to replace retiring Rep. Justin Amash, conceded to Republican candidate Peter Meijer Wednesday.

"We may not have won tonight, but this isn't the end of our fight for a better and bright West Michigan for all," Scholten said in a statement. 

Meijer tweeted that he spoke with Scholten and congratulated her on running a "strong and focused campaign."

"We may differ in approach, but we share common ground in wanting to see West Michigan thrive," he tweeted.

Amash left the Republican Party last year. He also considered running for the Libertarian Party's presidential nomination, but decided against it and ultimately chose to retire from Congress after finishing his current term.

At least 600,000 ballots in Maricopa County, Arizona, are still outstanding, ABC's "Good Morning America" weekend co-anchor Whit Johnson said.

These ballots are absentee ballots that voters brought to the polls in person on Election Day or the weekend before, he said on ABC News Live Prime. 

"We're looking at 600,000, maybe even more outstanding ballots here in the state of Arizona which could potentially swing things," he said. "We have seen Donald Trump getting closer and closer, inching and narrowing that lead that is currently possessed by Joe Biden, but right now the Democrats are confident. They're hanging on."

ABC News has not projected a winner in Arizona.

The Trump campaign filed a lawsuit in Georgia Wednesday night -- its third of the day. 

This suit, filed in Chatham County, home to Savannah, alongside the Georgia Republican Party, is seeking to order the county to compile, store and account for all ballots received after 7 p.m. on Election Day, the receipt deadline.

The suit alleges that the county may be mishandling ballots, and therefore inadvertently mixing up ballots that arrived on time with ones that arrived late.

This suit is based on a single allegation from an out-of-state Republican poll observer that involves less than 60 ballots.

-ABC News' Olivia Rubin

Protesters have gathered in cities across the country including New York, Philadelphia and Washington, D.C., Wednesday night to call for counting all of the votes cast in this election.