In more than two hours of oral arguments Monday, the U.S. Supreme Court debated whether federal law allows states to count mail-in ballots received after Election Day.

The Supreme Court is hearing arguments Monday in a case from Mississippi over whether states can count late-arriving mail ballots, a target of President Donald Trump.

Justice Brett Kavanaugh raised a key legal doctrine related to election cases about what a decision against the measure could mean for this year’s midterm elections.

President Trump, who has long railed against mail-in voting — including on Monday, when he called it “mail-in-cheating” — used the method himself in a Florida special election scheduled to take place ...

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