Supreme Court Upholds Post-Election Day Counting of Mail-In Ballots, Rejecting RNC Challenge

In a closely watched 5-4 decision, the United States Supreme Court ruled on Monday that federal law does not prohibit states from counting mail-in ballots that arrive after Election Day, provided they are cast and postmarked on time. The ruling in Watson v. Republican National Committee delivers a major victory to voting rights advocates and election administrators ahead of the November midterms, preserving the ballot-receipt grace periods currently utilized by 14 states and the District of Columbia. The decision resolves a high-stakes legal battle that threatened to upend election logistics nationwide and disenfranchise tens of thousands of voters whose ballots are delayed by the postal service.[1][2]

The case centered on a 2020 Mississippi state law that allows local election officials to tally absentee ballots received up to five business days after polls close, as long as the envelopes bear an Election Day postmark. The Republican National Committee, joined by the Mississippi Republican Party and the Libertarian Party of Mississippi, sued to strike down the statute. They argued that a federal law enacted in 1845, which established a uniform national Election Day on the first Tuesday after the first Monday in November, implicitly requires all ballots to be physically received by the government on that specific date.[3][5]

In an unusual ideological alignment, conservative Justice Amy Coney Barrett authored the majority opinion, bridging the court's typical divide. She was joined by Chief Justice John Roberts and the court's three liberal members—Justices Sonia Sotomayor, Elena Kagan, and Ketanji Brown Jackson. The coalition concluded that the Constitution grants states the primary authority to administer elections, and that Congress has never explicitly mandated a deadline for the receipt of mail-in ballots.[1][6]

"The electorate's choice is made when voting is complete, not when ballots are received," Justice Barrett wrote for the majority. She emphasized that the act of voting concludes when a citizen marks their ballot and entrusts it to the postal system on or before Election Day. "The election-day statutes say nothing about ballot receipt, and we cannot add to the words Congress chose," Barrett added, firmly rejecting the Republican challengers' interpretation of the 19th-century federal statutes.[2][6]

Justice Samuel Alito authored a sharp dissent, joined by Justices Clarence Thomas, Neil Gorsuch, and in part by Brett Kavanaugh. Alito argued that the majority's ruling defies the plain text and historical understanding of federal election law. "Election day is a specified date, not a span of multiple days," Alito wrote, warning that allowing ballots to trickle in for days or weeks after polls close creates a serious risk of undermining public confidence, particularly if late-arriving mail shifts the outcome of a close race.[2][4]

Monday's ruling officially reverses a previous decision by the U.S. Court of Appeals for the 5th Circuit, which had sided with the RNC and struck down the Mississippi law. That appellate ruling had sent shockwaves through the election administration community, raising fears that a nationwide ban on grace periods would be imposed just months before the 2026 midterm elections. By overturning the 5th Circuit, the Supreme Court has restored the status quo, ensuring that states retain the flexibility to accommodate postal transit times.[4][6]

The practical implications of the decision are vast. Beyond Mississippi, 13 other states and Washington, D.C., currently accept domestic mail ballots that arrive after Election Day, with grace periods ranging from a few days to two weeks. Furthermore, 30 states rely on extended receipt deadlines to process ballots from military personnel and overseas citizens under the Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA). Election data shows that overseas ballots are rejected for lateness at significantly higher rates than domestic ones, making these grace periods a critical safeguard for service members.[1][8]

The ruling drew immediate condemnation from former President Donald Trump, who has long criticized mail-in voting and frequently claims without evidence that extended ballot counting invites fraud. In the wake of the decision, Trump urged Congress to immediately pass the SAVE America Act, a sweeping Republican legislative package that would largely eliminate no-excuse mail voting and impose strict federal voter ID and proof-of-citizenship requirements.[1][4]

Conversely, Democratic leaders and civil rights organizations celebrated the decision as a triumph for democratic participation. DNC Chair Ken Martin declared that "democracy prevailed," while Sophia Lin Lakin, director of the ACLU's Voting Rights Project, noted that the court simply affirmed a practice that has existed since the Civil War. "A ballot mailed on time is a vote cast on time," Lakin said, emphasizing that voters should not be penalized for delays within the U.S. Postal Service that are entirely outside their control.[2][7]

Despite the Supreme Court's validation of state authority, the battle over mail-in ballots is likely to shift from federal courthouses to state legislatures. Shortly after the ruling was handed down, Mississippi's Republican Attorney General Lynn Fitch publicly urged state lawmakers to voluntarily repeal the five-day grace period in their next session. Fitch argued that requiring all ballots to be received by Election Day is necessary to "prioritize improving public trust in our elections," signaling that conservative efforts to tighten voting windows will continue at the local level.[5][8]

The decision arrived as a surprise to many legal observers, especially following a term where the conservative supermajority has frequently ruled against voting rights advocates. Earlier this spring, the court allowed Louisiana to effectively dismantle a key provision of the Voting Rights Act, sparking a wave of redistricting across the South. In Watson v. RNC, however, the court's strict textualist approach to the 1845 statute ultimately shielded state-level voter protections from federal interference.[2][4]