The Supreme Court’s conservative majority sounds skeptical of state laws that allow the counting of late-arriving mail ballots, a target of President Donald Trump. The court heard arguments Monday in a case from Mississippi that also could affect voters in 13 other states and the District of Columbia, which have grace periods for ballots cast by mail. An additional 15 states that have more forgiving deadlines for ballots from military and overseas voters also could be impacted. A ruling is expected by late June, early enough to govern the counting of ballots in the 2026 midterm congressional elections. The court challenge is part of Trump’s broader attack on most mail balloting.