The U.S. Supreme Court is at the center of a legal battle over how mail-in ballots are handled — a dispute that experts say could have wide-ranging effects on future elections, including how votes are counted and how election laws are challenged in court.

What’s at Issue
At the heart of the controversy is a debate over whether states may count mail-in or absentee ballots received after Election Day so long as they were postmarked by Election Day. Dozens of states currently allow ballots to be counted even if they arrive days later, a practice that expanded dramatically during the COVID-19 pandemic to accommodate voters.

In November 2025, the Supreme Court agreed to review Watson v. Republican National Committee, a case challenging a Mississippi law that permits ballots postmarked by Election Day to be counted if received within five business days afterward. If the Court ultimately decides that federal election statutes require ballots to be received by Election Day, it could upend similar laws in many states. (Wikipédia)

What the Court Has Already Ruled
In early 2026, the Supreme Court issued a key ruling in Bost v. Illinois State Board of Elections — not about whether late-arriving ballots are lawful, but about who has the right to challenge election rules. By a 7–2 vote, the Court held that federal candidates do have legal standing to sue over how election laws are written and applied. This decision may open the door to more legal challenges over voting procedures ahead of future elections.