An upcoming U.S. Supreme Court case could shake up future elections for Nevada and 15 other states that allow post-Election Day mail-ballot counting.

Earlier this month , the higher court agreed to hear the case out of Mississippi that’s challenging a state law that permits mail ballots postmarked by Election Day there to be tallied upwards of five days after polls close.

Nevada gives those ballots up to four days to arrive, and up to three days for the ones without a postmark.

The Nevada Supreme Court affirmed the deadlines last year, denying an appeal by the Republican National Committee President Donald Trump’s campaign and the Nevada Republican Party. The party argues that the practice of delayed counting undermines election integrity and trust in the process.

Trump, who won Nevada

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