The US Supreme Court argued Watson v. RNC on 23 March 2026, and a decision is expected by the end of June. The case tests whether state mail-ballot grace periods, which permit ballots postmarked by Election Day but received after, conflict with the federal Election Day statute. Fourteen states plus DC operate grace periods. Washington's 21 days is the longest; Mississippi's five-day rule is the case at bar. Roughly 4 million military and overseas voters rely on grace periods 1.
Most observers expect the Court to rule for the Republican National Committee and strike down the grace periods. The same six-justice majority decided Louisiana v. Callais in April. A late-June ruling would leave the affected states approximately four months to retrain election officials and rewrite guidance before November. States with 21-day grace periods would lose roughly one-third of their counted military and overseas ballots overnight, an estimated 1.3 million votes removed from final tallies in the most-affected jurisdictions.
At issue is whether 2 U.S.C. § 7's statement that Election Day is the Tuesday after the first Monday in November fixes both the casting and the counting deadline. Petitioners argue the federal statute fixes both; respondents argue it fixes only when ballots must be cast, leaving counting deadlines to the states. University of California, Irvine election-law professor Richard Hasen has noted that the Court's recent federalism cases push in the petitioners' direction; the Brennan Center counter-view, advanced in its amicus brief, is that overseas military ballots have been counted post-Election Day under federal law since 1986 without a constitutional crisis.
The decision is independent of the redistricting front and runs on the Court's own calendar. It is also the only court action this fortnight whose effects do not depend on the appellate sequence: when SCOTUS speaks, the rule changes for every grace-period state in the same instant. Election officials in Pennsylvania, North Carolina and Nevada, three competitive states with grace periods, would need to rewrite ballot-counting guidance inside the summer.
