Though it looks like Democratic nominee Joe Biden has won, the outcome of the presidential election is so close in several states that recounts are likely to happen.

Per the U.S. Constitution , its up to states how they do congressional and presidential elections, and so the procedures for a recount are a matter of state law. In some states, a close result can automatically trigger a recount; in others, a campaign can request one.

Recounts are unlikely to dramatically shift the results. FairVote, a nonpartisan group that pushes for electoral reform, analyzed nearly 2,000 recounts in statewide elections over the past two decades and found that only three reversed the result. The average shift in the margin in those statewide recounts was 430 votes a far smaller swing than President Donald Trump would need to overtake Biden in key states.

Heres what the recount procedures look like in the six states everyone is watching.

Georgia

Georgia seems most likely to head toward a recount. As of Friday afternoon, Joe Biden had a narrow lead of about 4,000 votes, with nearly 5 million votes cast. Officials are still counting absentee and provisional ballots. There are also nearly 9,000 outstanding military and overseas absentee ballots that will still be counted if they were postmarked by Election Day and are received by the end of Friday.

Under state law , campaigns can request a recount if the margin of victory is less than half of one percent of the total votes cast. The law does not specify when or how quickly the recount has to happen.

As we are closing in on a final count, we can begin to look toward our next steps, Georgia Secretary of State Brad Raffensperger (R) said Friday . With a margin that small, there will be a recount in Georgia.

Wisconsin

Wisconsin does not require automatic recounts, but a candidate can request a recount if the vote margins are within 1%. As of Friday afternoon, Biden led Trump by less than 1% 49.6% to 48.9% prompting the Trump campaign to request a recount on Wednesday, which according to state law the campaign will have to pay for.

The campaign, however, wont be able to file a recount petition until Wisconsin certifies its results, which are due the latest Dec. 1. The recount must be completed within 13 days after the original results are in.

Trump campaign manager Bill Stepien alleged voter suppression in several Wisconsin counties, despite no evidence of any wrongdoing at the polls or in the ballot count. There have been reports of irregularities in several Wisconsin counties which raise serious doubts about the validity of the results, Stepien said on Wednesday.

Despite being asked for evidence of the alleged widespread voter fraud, the Trump campaign has none.

Wisconsin Elections Commission Director Meagan Wolfe rebuked the Trump campaigns claim, telling reporters on Wednesday: Its insulting for our local election officials to say that yesterdays election was anything but an incredible success.

Wisconsin has some recent recount experience. In 2016, Green Party nominee Jill Stein requested a recount, which cost upward of $3.5 million and only changed roughly 1,500 votes out of 3 million.

Pennsylvania

Voters here can request a recount but an election decided by less than half a percent of the total vote automatically triggers one. As of Friday afternoon, the vote total put Biden ahead of Trump by less than 15,000 votes, with 49.5% of the vote to Trumps 49.3%, apparently still within the recount range with 2% of ballots still outstanding.

If a recount does occur, state law says it would have to be completed by Nov. 24.