Vice President Kamala Harris has officially conceded the presidential race to newly elected President Donald Trump. But in places like Arizona, votes were still being counted Wednesday to decide several other hotly contested downballot races.

Former television news anchor and staunch Trump supporter Kari Lake will compete against Democratic U.S. Rep. Ruben Gallego for Arizona’s open seat in the U.S. Senate, which is being vacated by Democrat-turned-independent Sen. Kyrsten Sinema.

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As of Wednesday afternoon, polls showed Gallego with a razor-thin lead over Lake, with about two-thirds of the vote. But when will we know who won and why it’s taking so long?

Election officials in Arizona warned before Election Day that it could take up to two weeks for results in the state to be tabulated. In addition to the high turnout in this election, ballots are also two pages long in places like Maricopa County, the state’s most populous county.

But no matter who wins Arizona’s open seat in the U.S. Senate, they won’t be able to change the balance of power in the chamber.

Heading into Election Day, Democrats had control of the Senate by a 51-49 margin, while bringing with them four independents who aligned with Democrats. But for the first time in four years, Republicans have regained control.

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Republicans flipped Senate seats away from Democrats in West Virginia, Montana and Ohio on Tuesday. That means Republicans will have at least 52 seats in 2025, with the possibility of gaining several more when all the results are in.

In the meantime, it remains to be seen which party will take control of the House of Representatives.

Should the House of Representatives turn blue, Democrats will be able to keep Trump’s power in check during his second term as president. But should the Republican Party retain its narrow majority, a trifecta of Republican control will be in play next year, making it easier for Trump to implement his agenda.