The U.S. Supreme Court is expected to force Nevada's election officials to implement new rules regarding mail-ballot grace periods. This comes after Mississippi, other states, mandate that election workers automatically count ballots postmarked by Election Day even if they arrive days later. This has led to delays in tabulating and raised concerns about election integrity. The case was heard in court by Republicans and Libertarians who argue that Congress has designated federal Election Day as the first Tuesday after the first Monday of November, thus requiring all ballots to be received by that day. However, while states have wide latitude to set elections, Congress has the ultimate authority to do so.