The U.S. Supreme Court heard arguments Wednesday in a case that could decide whether political candidates have the right to challenge Illinois’ vote-by-mail law in court.

U.S. Rep. Mike Bost, a Republican from Murphysboro, and a pair of Illinois primary delegates for President Donald Trump sued the Illinois State Board of Elections in 2022, argue that the state’s law allowing late-arriving mail-in ballots to be counted up to 14 days after the polls close violates the federal law establishing an “Election Day.” Both a lower federal trial court and federal appeals court have ruled Bost lacked standing to sue.

Republicans at both the state and national level embraced mail-in voting in the 2024 election cycle after pushing back against it in recent years. The Illinois Republican Party joined

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