Mail-In Ballot Deadlines Put Supreme Court in 2026 Election Fray

The US Supreme Court will consider upending key election deadlines in as many as 29 states with a case that draws the justices into President Donald Trump’s campaign against mail-in ballots.

The justices hear arguments Monday in a Mississippi clash over laws that allow ballots to be counted even if they don’t arrive until shortly after Election Day. The Republican Party and the Trump administration say grace periods across the country are incompatible with federal law.

The dispute is part of a multipronged GOP effort to transform federal election rules in advance of a November ...