The Supreme Court heard arguments this week in a case that could reshape how more than a dozen states handle mail-in voting. At issue is a Mississippi law that lets mail-in ballots arrive up to five business days after Election Day, so long as they are postmarked on time. The Republican National Committee says that arrangement violates federal law, and several conservative justices appeared inclined to agree.
The case, Watson v. Republican National Committee, centers on a Mississippi statute enacted during the COVID-19 pandemic and later made permanent. A lower court, the 5th U.S. Circuit Court of Appeals, ruled that federal law preempts it, holding that "Election Day" means the day the ballot box closes, not simply the day a ballot is mailed. Mississippi appealed to the Supreme Court.
A ruling could come as late as June, and the stakes extend well beyond Mississippi. Fourteen states plus the District of Columbia currently allow similar grace periods for domestic mail-in ballots, The Hill reported. Twenty-nine states accept military and overseas ballots received after Election Day. If the Court sides with the RNC, election officials across the country will have only months to overhaul procedures before the November general election.
During oral arguments, the Court's conservative wing pressed hard on what "Election Day" actually means under federal statute. Chief Justice John Roberts framed the question bluntly:
"If Election Day is the voting and taking, that has to be that day."
Justice Samuel Alito went further, warning that without clear limits, the concept of a single election day dissolves entirely. "We don't have Election Day anymore," Alito said. "We have election month." He suggested that "line-drawing decisions" may be inevitable to avoid a rule of "anything goes."
As we noted when justices signaled deep skepticism toward counting late-arriving mail ballots, the tenor of the bench left little doubt about the direction of the conservative majority's thinking.
Justice Brett Kavanaugh, as Fox News reported, raised the specter of public confidence collapsing when results shift days after polls close:
"If the apparent winner the morning after the election ends up losing due to late arriving ballots, charges of a rigged election could explode."
That concern is not hypothetical. Americans watched results flip in multiple states during the 2020 count as late-arriving mail ballots were tallied. The erosion of trust that followed is exactly the kind of damage the RNC's challenge aims to prevent.
Justice Elena Kagan pushed back, questioning why the RNC takes issue with ballots arriving after Election Day but not with early voting. "A normal person says, 'OK, well, when I early vote, I'm not doing that on that first Tuesday,'" she said.
Paul Clement, representing the Libertarian Party of Mississippi on the same side as the RNC, responded that the history surrounding early voting is "different" and that votes need to be "consummated" by Election Day. Roberts seemed unconvinced by the distinction, telling Clement: "So maybe I just missed it, but it seems to me maybe you're not saying anything other than, 'Well, that's different.'"
Solicitor General D. John Sauer told the Court that the Trump administration agrees with the position Clement laid out. A Department of Justice amicus brief, as Breitbart reported, argued that "'Election Day' is the day when 'the proverbial ballot box is closed,' and thus when officials must be in 'custody' of every ballot."
The early-voting question is a fair one on its face. But it conflates two very different problems. Early voters still cast their ballots before the deadline. Grace-period rules let ballots trickle in for days, or in Illinois's case, up to 14 days, after the election has ended. The distinction between voting early and having your ballot counted late is not a technicality. It goes to the core of what a deadline means.
Even before the Court rules, state election offices are bracing for change. Oregon, an all-mail voting state with a seven-day grace period enacted in 2022, is already updating voter guidance. Tess Seger, a top aide to Oregon Secretary of State Tobias Read, told The Hill that voters are now being advised to mail ballots at least seven days before Election Day. The office is also increasing its communications staff.
The numbers show why Oregon officials are concerned. In 2022, nearly 32,000 ballots received after Election Day within the grace period were counted because they carried valid postmarks. That figure dropped to about 13,000 in 2024. But Seger said the office expects those numbers to grow in 2026 because of increased delays in postmarking and mail delivery by the U.S. Postal Service. Voters who live 50 miles or more from Portland or cannot drive would be most impacted, she said.
The broader debate over whether states can keep counting ballots days after Election Day has forced officials in blue states to confront an uncomfortable reality: their mail-voting systems were built on the assumption that grace periods would survive legal challenge.
In Massachusetts, Secretary of State Bill Galvin, a Democrat, is exploring legislative options to extend in-person polling hours on Election Day and expand electronic voting options for military voters. Spokesperson Debra O'Malley acknowledged the difficulty of planning when the ruling could land just months before an election:
"Unfortunately, it is difficult to plan for a change that will occur just months before an election, especially when we can't know exactly what the court's decision will say."
Massachusetts currently allows a three-day grace period for postmarked domestic ballots. O'Malley said eliminating that window would disenfranchise some eligible voters and expressed particular concern about overseas voters.
In Illinois, the State Board of Elections plans to help local election authorities inform voters of any new deadline through social media, traditional media, and direct contact with voters when they apply for and receive mail-in ballots. Matt Dietrich, a board spokesperson, said voters will also be encouraged to use secure drop boxes or personal delivery instead of relying on the Postal Service.
Opponents of the RNC's challenge frame the case as voter suppression. Rebekah Caruthers, president and CEO of the Fair Elections Center, warned that the ruling would ripple far beyond Mississippi. "This isn't just a singular action that's not going to have a ripple effect," she said. "It puts an unfair burden on states."
Andrew Garber, counsel at the Brennan Center for Justice's Voting Rights and Elections Program, argued there is no "meat on the bone" of the RNC's position and questioned where a literal reading of "day for the election" would start and stop. He cast the case as part of a broader pattern, using the phrase "voter suppression" and warning that cumulative policy changes trim voters from the rolls.
But consider the numbers. NBC data cited in The Hill's reporting show that in the 2024 presidential election, more than 88 million voters cast ballots early, by mail or in person. Some 41 percent of registered Democrats and 38 percent of registered Republicans voted early. In the 2022 midterms, more than 47 million voted early, with 45 percent of Democrats and 35 percent of Republicans casting early ballots.
The gap exists, but it is not enormous. Both parties rely heavily on early and mail voting. What the grace-period debate really concerns is not whether people can vote by mail, they can, and will, but whether ballots that arrive after Election Day should count. Clement argued states would have "plenty of time" to adjust because the ruling would affect only the November general election, not primary races.
As Justice Alito reminded the Court during oral arguments, the plain text of federal law sets one day for the election. Treating that day as a suggestion rather than a deadline is what created the problem in the first place.
Meanwhile, the broader push for tighter election rules continues outside the courtroom. Republicans in Congress and at the state level have pressed for measures like voter ID requirements and proof-of-citizenship checks, including the SAVE America Act. President Trump has drawn a hard line on that legislation, and grassroots energy behind election integrity remains strong across the country.
A group of states filed a brief arguing they have "the constitutional authority to make individualized judgments on how best to receive and count votes in federal elections." That argument may carry weight with some justices. But it runs headlong into the text of the federal statute that Congress passed to establish a uniform Election Day.
The Court's decision, expected by June, will land in the middle of a charged election year. If the justices rule that ballots must be received by Election Day, fourteen states and D.C. will need to rewrite their procedures. Election officials will need to educate voters. And the Postal Service, already struggling with delivery delays, will face even more scrutiny over its reliability.
None of that is a reason to ignore the law. If Congress set one day for the election, states do not get to unilaterally extend it by five days, or seven, or fourteen. Voters who want their ballots to count have a straightforward option: mail them early, use a drop box, or vote in person. The rules are not hard. They just need to be enforced.
Election Day means something, or it means nothing. The Court appears ready to remind the country which one it is.
