Former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE on Friday celebrated vote counting efforts underway in three states where prominent battles in Tuesday's midterm elections remain undecided.

In a tweet, Biden urged local elections officials in Arizona, Georgia and Florida to continue ongoing vote tabulations "fairly" and "transparently" despite controversy surrounding those efforts.

"It’s the most fundamental American right: the right to vote — and for your vote to be counted," Biden tweeted Friday afternoon.

"Count all the votes in Florida, Georgia, and Arizona. Count them fairly. Count them transparently," he added.

It’s the most fundamental American right: the right to vote — and for your vote to be counted. Count all the votes in Florida, Georgia, and Arizona. Count them fairly. Count them transparently. — Joe Biden (@JoeBiden) November 9, 2018

The gubernatorial races in Florida and Georgia remained officially too-close-to-call on Friday afternoon as the two races looked likely to head to recounts. Senate races in Florida and Arizona also remained uncalled, as officials continued to count the remaining votes from Tuesday's elections.

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Trump on Friday attacked vote-counting efforts in Broward County, Fla., while blasting incumbent Sen. Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (D) in his race against Gov. Rick Scott (R) and Tallahassee Mayor Andrew Gillum (D), who conceded his gubernatorial fight against Ron DeSantis Ron DeSantisTrump may meet with potential Supreme Court pick in Miami Florida governor unveils legislation targeting protesters in 'violent or disorderly' demonstrations Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (R) earlier this week.

"Mayor Gillum conceded on Election Day and now Broward County has put him 'back into play.' Bill Nelson conceded Election - now he’s back in play!? This is an embarrassment to our Country and to Democracy!" he tweeted.

Gillum said Thursday that he would be open to the possibility of asking for a recount.

Scott's campaign and other Florida Republicans have decried the vote-counting process in Florida and the possibility of a recount, accusing Democrats of trying to "steal" the election.

Mayor Gillum conceded on Election Day and now Broward County has put him “back into play.” Bill Nelson conceded Election - now he’s back in play!? This is an embarrassment to our Country and to Democracy! — Donald J. Trump (@realDonaldTrump) November 9, 2018

In the 2016 Election I was winning by so much in Florida that Broward County, which was very late with vote tabulation and probably getting ready to do a “number,” couldn’t do it because not enough people live in Broward for them to falsify a victory! — Donald J. Trump (@realDonaldTrump) November 9, 2018

Trump also attacked vote-counting efforts in Arizona on Friday, where he alleged that voter fraud had occurred and appeared to suggest the possibility of calling a new election for the state's Senate race between Reps. Kyrsten Sinema (D) and Martha McSally Martha Elizabeth McSallyTumultuous court battle upends fight for Senate Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee The Hill's Campaign Report: Biden goes on offense MORE (R).

Just out — in Arizona, SIGNATURES DON’T MATCH. Electoral corruption - Call for a new Election? We must protect our Democracy! — Donald J. Trump (@realDonaldTrump) November 9, 2018

Sinema on late Thursday took a narrow lead over McSally in the hotly contested race.