Supreme Court Backs Challenge to Mail Ballot Counting Rules
The Supreme Court ruled 7-2 Wednesday that congressional candidates have the legal standing to challenge state election laws governing late-arriving mail ballots, potentially reshaping voting procedures nationwide with implications for 2028 and beyond.
In a decision delivered by Chief Justice John Roberts in Bost v. Illinois State Board of Elections, the high court reversed lower court rulings and determined that Rep. Mike Bost, a Republican from Illinois, can pursue his lawsuit challenging a state law that counts mail ballots postmarked by Election Day even when they arrive up to two weeks later.
The Core Legal Question
Bost and two other political candidates initially argued that counting ballots received after Election Day violates federal law, specifically pointing to statutes that designate Election Day as the Tuesday following the first Monday in November. Lower courts dismissed the case, citing concerns that the candidates lacked sufficient legal standing to bring the challenge.
The Supreme Court’s reversal focused narrowly on the standing question—whether candidates themselves can mount such challenges. The justices found that Bost, who won his last election with 75% of the vote, faced genuine costs in monitoring the ballot-counting process and protecting against potential election disputes, sufficient to grant him legal standing.
Broader Electoral Implications
The decision has immediate consequences for election administration. Illinois law currently requires election officials to count mail-in ballots postmarked or certified no later than Election Day and received within two weeks of that date. More than a dozen states, along with the District of Columbia, maintain similar provisions allowing mail ballots received after Election Day as long as they bear Election Day postmarks.
By clearing the path for candidate lawsuits, the Supreme Court has set the stage for the justices to address the broader constitutional question during the spring: whether states retain authority to count late-arriving mail ballots or whether federal law prohibits the practice.
Political Stakes and Administration Support
The case has attracted significant political attention. The Trump administration weighed in to support Bost, with the Republican president asserting that late-arriving ballots and protracted electoral counts undermine public confidence in elections. Illinois state officials had warned that allowing the lawsuit would “open the floodgates” for additional election litigation and “cause chaos” for election administrators.
Justice Elena Kagan was among those dissenting, with critics of the decision arguing that the ruling minimizes particularity requirements in standing doctrine and expands litigation access in election matters.
What Comes Next
The full merits of the election challenge—whether states can continue counting late-arriving mail ballots—will be litigated in the coming months, with a decision expected before the 2026 midterm elections and well before the 2028 presidential race. The outcome could fundamentally alter how states process absentee and mail-in ballots nationwide.
