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The Supreme Court on Monday upheld a Mississippi law that allows officials to tally mail-in ballots postmarked by Election Day that arrive later, a decision that keeps voting procedures in place in several states as the midterm elections loom.

In an ideologically mixed 5-4 ruling, the justices turned aside a challenge by Republicans and Libertarians, who argued federal law preempts a Mississippi statute that allows the counting of such ballots that arrive up to five days after polls close.

The decision could make less likely similar legal challenges in 14 states that allow the counting of ballots that arrive days or weeks after polls close, and others that allow military members to return ballots later. Most states require mail-in ballots to be received by Election Day.

Justice Amy Coney Barrett delivered the opinion for the majority, which included Chief Justice John G. Roberts Jr. and the court’s three liberals. Barrett said federal election law did not address when ballots should be received.

“The election-day statutes say nothing about ballot receipt, and we cannot add to the words Congress chose,” Barrett wrote.

The ruling came over the objections of four of the court’s conservatives. Justice Samuel A. Alito Jr. wrote the opinion for the group, which included Justices Clarence Thomas, Neil M. Gorsuch, and Brett M. Kavanaugh.

“Not only is today’s decision inconsistent with statutory text, legal context, historical practice, and precedent; it also threatens to produce lamentable consequences,” Alito wrote. “The majority’s holding spawns a slurry of troubling election-law questions and risks further undermining Americans’ confidence in election integrity.”

President Donald Trump and some Republican allies have falsely argued that voter fraud is rampant in mail-in balloting. Trump partly blamed his loss in the 2020 presidential election on mail-in votes and unsuccessfully called on states to stop tallying them during the contest.

Trump called the ruling a “tremendous loss” in a post on Truth Social. He called on Congress to pass the Save America Act, which tightens voter identification laws.

Republicans in a number of states have launched legal challenges to mail-in voting, which has grown in popularity since the onset of the coronavirus pandemic. One study found about 1 in 3 voters voted by mail in 2024, but the practice is more widespread in Democratic-leaning states.

Conservatives in Congress also have introduced legislation to limit mail-in voting.

In March, Trump issued an executive order telling the Postal Service to send ballots only to voters who appear on lists of citizens created by states in conjunction with the federal government. A federal judge in Massachusetts blocked that provision of the executive order last week, saying states — not the president — are responsible for setting election rules.

Despite his criticism of mail-in voting, Trump voted by mail in a special election in Florida earlier this year.

In the case decided by the high court, the Republican National Committee, the Mississippi Republican Party, a state voter, and a county election commissioner had sued Mississippi in 2024, claiming it was illegal to count mail-in ballots that arrive after polls close because federal law sets elections for a specific day. The Libertarian Party later filed a similar suit.

The cases were consolidated by a federal judge, who allowed groups of veterans and retirees to intervene in the suit on behalf of Mississippi. The judge dismissed the case, but the U.S. Court of Appeals for the 5th Circuit reversed that ruling. Mississippi then appealed to the Supreme Court.

During arguments in March, Paul D. Clement, an attorney for the conservatives, told the justices that casting and counting ballots at the same time has long been “intertwined.” He said allowing mail-in ballots to be counted after Election Day could increase fraud and undermine faith in elections, particularly if the winning candidate was not the one ahead when polls closed.

“The losers are going to doubt the result, full stop,” Clement said. “That is bad for our system.”

Mississippi Solicitor General Scott G. Stewart countered that existing law required only that voters fill out their ballots by Election Day. He said mail-in voting has a long history in the United States, pointing to field voting that occurred during the Civil War.

“States have allowed it for over a century, and Congress has respected it,” Stewart said.

This term has been an active one for the justices on voting and election issues. In January, the court allowed a Republican congressman from Illinois to challenge the state’s mail-in balloting laws, finding candidates have inherent standing to sue over election rules.

The case brought by Rep. Mike Bost (R., Ill.) also argues that federal law prohibits ballots from being counted after Election Day. The case was sent back to the lower courts.

The justices also severely limited a key section of the Voting Rights Act, which has cleared the way for a number of Republican-controlled states in the South to carve up districts held mostly by Black Democrats ahead of the midterm elections. Hundreds of other minority officeholders could be redistricted out of their seats in state and local boards.

The court has yet to rule in a case challenging limits on spending coordinated between political parties and candidates that is being pushed by the Republican Party. Striking down the spending limits could give Republicans a big money boost in November.

Fourteen states provide grace periods for all mail ballots, and another 16 provide them for military and overseas voters. Republican-led states have been steering away from ballot grace periods recently, with Kansas, North Dakota, Ohio, and Utah eliminating them last year, according to Voting Rights Lab.

RNC Chairperson Joe Gruters said Republicans would push Congress to pass legislation requiring ballots in all states to be returned by Election Day.

“Democrats are inviting chaos at the ballot box by allowing elections to drag on for days and weeks after voters cast their ballots,” he said in a statement.

Voting rights advocates praised the decision, saying they feared the court could reverse long-standing policies on when ballots are due.

“Good news rarely comes out of this Supreme Court, but today’s ruling is a win for our democracy,” NAACP President Derrick Johnson said. Virginia Kase Solomón, president of Common Cause, said the decision was correct because voters “shouldn’t lose their voice because of mail delays outside their control.”