Although the appellate judges firmly asserted that counting late ballots violates federal law, even if those ballots are postmarked by Election Day, the judges stopped short of an order immediately blocking Mississippi from continuing the practice. Their ruling noted federal court precedents have discouraged court actions that change established procedures shortly before an election.

The outcome may be negligible in most elections in heavily Republican Mississippi, but the case could affect voting in swing states if the Supreme Court ultimately issues a ruling.

The appeals court said its ruling Friday would not be returned to a lower court until seven days after the deadline for appealing their decision has passed — which is usually at least 14 days. That would put the effect of the ruling well past Nov. 5.

UCLA law professor Richard Hasen wrote on his election law blog that the appeals court ruling was a “bonkers opinion” and noted that “every other court to face these cases has rejected this argument.”

Republicans filed more than 100 lawsuits challenging various aspects of vote-casting after being chastised repeatedly by judges in 2020 for bringing complaints about how the election was run only after votes were tallied.

Republican National Committee Chairman Michael Whatley praised the ruling for upholding “commonsense ballot safeguards” and said voters deserve “a transparent election which ends on November 5th.”

A spokesperson for the Democratic National Committee did not immediately comment on the ruling.

Mississippi is one of several states with laws allowing mailed ballots to be counted if they are postmarked by Election Day, according to the National Conference of State Legislatures. The list includes swing states such as Nevada and states such as Colorado, Oregon and Utah that rely heavily on mail voting.

In July, a federal judge dismissed a similar lawsuit in Nevada. The Republican National Committee is asking the 9th Circuit Court of Appeals to revive that case.