The U.S. Supreme Court will hear oral arguments Monday in a case that could end the practice of counting mail-in ballots that trickle in days or even weeks after Election Day, a fight the Republican National Committee brought and one that could reshape voting rules in more than a dozen states before the 2026 midterms.
At issue is Mississippi's five-day grace period, which lets mailed ballots postmarked by Election Day arrive up to five business days later and still be counted. The RNC and the Libertarian Party of Mississippi sued Mississippi Secretary of State Michael Watson, a Republican, arguing that federal law means what it says: there is one Election Day, and ballots must be in hand by then.
The U.S. 5th Circuit Court of Appeals agreed with the challengers and struck down Mississippi's law. Now the Supreme Court will decide whether to uphold that ruling, and if it does, the fallout could reach fourteen states that currently allow grace periods for regular mail ballots, plus the District of Columbia and three U.S. territories. A decision is expected by the end of June.
The RNC's argument is straightforward. Congress set a single day for federal elections. Allowing ballots to arrive after that day, the committee contends, stretches the election past its legal deadline.
The RNC told the Supreme Court in its brief that "when Congress designated a single 'day for the election,' it set a deadline," adding that if a state law extends the election past that point, "it conflicts with Congress's timing decision and to that extent is void."
Ohio state Sen. Theresa Gavarone, a Republican who championed her state's ban on the practice last year, put it bluntly:
"Election Day is Election Day for a reason. Allowing ballots to be delivered days after the election does nothing but hurt the integrity and credibility of our elections."
Supporters of the grace periods see it differently. They argue the Constitution gives states authority to set the "times, places and manner" of elections, and that legislatures have long used that power to accommodate the realities of mail delivery. A group of local election officials and local governments told the court that "state legislatures have recognized this issue and set election deadlines that balance the interests of canvassing speed and ballot security depending on the specific needs of each individual state."
Fourteen states currently let regular mail ballots arrive after Election Day and still count. The grace periods range from a single day in Texas to a full 21 days in Washington state. Beyond that, 29 states allow late arrival of military and overseas ballots. If the Court sides with the RNC, all of those laws face potential challenge.
The Washington Times reported that Mississippi argues striking down its grace period could create nationwide election "chaos" and undermine similar laws across the country. Mississippi Attorney General Lynn Fitch told the court that "the stakes are high: ballots cast by, but received after, election day can swing close races and change the course of the country."
That's not an abstraction. Stuart Holmes, director of elections for the Washington Secretary of State's office, said 127,000 ballots arrived after Election Day in his state during the 2024 cycle. If the Court rules against grace periods, every one of those ballots, cast on time, mailed on time, would have been thrown out.
"There's no way to resolve that issue. There's no second chance."
Holmes's point lands hard. But it also reveals the problem from the other side. If an election can't be called for three weeks because ballots keep arriving, public confidence erodes. And that's exactly what happened in 2020, when delayed counts fueled suspicion and bitterness across the political spectrum.
Legislatures haven't waited for the Court to act. Four states, Ohio, Kansas, North Dakota, and Utah, eliminated their grace periods last year. Minnesota shortened its ballot deadline from the close of polls on Election Day to 5 p.m. The trend line is clear: red and purple states are tightening the window.
Ohio's case is instructive. Republican Gov. Mike DeWine signed the bill eliminating his state's grace period, but he wasn't happy about it. DeWine said the Mississippi lawsuit forced his hand and that he had vowed not to sign any more election restrictions championed by fellow Republicans.
"I believe that this four-day grace period is reasonable, and I think for many reasons it makes a lot of sense."
He signed anyway. The political pressure was too strong, and the legal ground was shifting beneath him.
Meanwhile, a few states moved in the opposite direction. California proposed extending its ballot deadline by three days. Virginia proposed extending its deadline by five hours. Kansas, which had just eliminated its grace period, proposed extending its new deadline by an hour depending on the county. The patchwork grows messier by the session, which is part of why the Supreme Court's intervention matters.
About 30% of voters across the country used mail voting during the 2024 presidential election. That's a massive share of the electorate, and it isn't going back to zero. The question is whether the rules governing those ballots should enforce a hard deadline or build in a cushion for postal delays.
Defenders of grace periods point to the U.S. Postal Service itself as part of the problem. An updated USPS policy enacted in December stated that postmarks might not indicate the first day the Postal Service receives the mail, but rather the day it was handled at one of its processing centers. Earlier this year, a group of U.S. senators told the postmaster that processing centers can be farther away from some communities because of consolidations.
Adriane Mohlenkamp, a 48-year-old stay-at-home mom and volunteer in Athens, Ohio, who is not affiliated with either major party, described what the old grace period meant to her:
"I live in a rural part of the state and sometimes our mail has to go to a larger city and then come back. It gave me a safe feeling, because, even if I do my due diligence and return it in enough time, I can't always anticipate what it does when it leaves my hands."
That's a fair concern. But the conservative answer isn't to keep stretching Election Day into Election Week. It's to fix the mail system, give voters clear deadlines, and hold the Postal Service accountable for timely delivery. The solution to a broken mailbox isn't to abolish deadlines.
This case arrives at the Supreme Court during a term that has already shown the justices' willingness to weigh in on politically charged disputes, as seen when the Court blocked a Democrat-backed redistricting scheme targeting a Republican-held New York district. The current Court has also rebuked activist appeals courts on immigration enforcement and sided with parents over California's gender-transition secrecy policies. The pattern suggests a bench willing to enforce plain statutory text against creative state workarounds.
Just The News reported that the case is formally styled Watson v. Republican National Committee, and that fifteen other states plus the District of Columbia have similar laws on the books. Jason Snead, executive director of the Honest Elections Project, framed the stakes plainly:
"The Supreme Court now has the chance to set the record straight: Federal law clearly says that ballots must be received by Election Day. This case gives the Supreme Court the chance to resolve that question once and for all."
State and big-city election officials filed with the court warning of "the risks of confusion and disenfranchisement" if grace periods vanish suddenly. Voting rights groups, local election officials, and organizations representing military and overseas voters filed briefs supporting Mississippi, arguing that eliminating grace periods could affect ballot verification, provisional ballot processing, and the handling of military and overseas ballots.
Katy Owens Hubler, elections program director at the National Conference of State Legislatures, acknowledged the timing problem. She noted that large states can struggle to distribute mailed ballots and get them returned within tight windows, and that the postmark issue has grown trickier after recent USPS changes.
"It's not ideal to do it in a big election year like this year. Voters do adapt, but if there is a change from a postmarked-by to a received-by date, that needs to be communicated and signaled well in advance."
A ruling is expected before the end of June, just months before the November midterms. Newsmax noted that election officials warned a ruling against Mississippi could force rapid changes in 14 states, potentially rejecting large numbers of ballots and fueling a broader Republican push for stricter receipt rules. Washington state alone could see over 100,000 ballots rejected based on 2024 numbers.
That's a real cost. But so is the slow erosion of a fixed Election Day, the one moment when all voters, in all states, cast their ballots under the same clock. Grace periods may have started as a practical accommodation. They've become a loophole that delays results, invites suspicion, and lets the Postal Service's failures dictate who gets counted and who doesn't.
The current Supreme Court has shown it can deliver broad, even unanimous rulings when the statutory text is clear. Congress said "a day." Not a week. Not three weeks. A day.
If states want to make mail voting work, they should give voters clear deadlines and hold the Postal Service to them. What they shouldn't do is redefine "Election Day" to mean whatever's convenient, and then call it democracy.
