PHILADELPHIA — U.S. Supreme Court Justice Samuel A. Alito Jr. on Wednesday asked participants in a key Pennsylvania gerrymandering case to respond to a request from top Republican lawmakers that the nation’s highest court step in and block the new congressional map.

State Senate President Pro Tempore Joe Scarnati, a Jefferson Republican, and House Speaker Mike Turzai, an Allegheny Republican, have asked the U.S. Supreme Court to stay the Pennsylvania Supreme Court’s ruling overturning the previous congressional map and imposing a new one.

Alito gave participants in the case until Monday afternoon to file their responses.

He made a similar move a few weeks ago after Scarnati and Turzai filed essentially the same request to step in and stop the Pennsylvania Supreme Court from overturning the state congressional map drawn in 2011. In that first request, Alito also sought responses from the parties in the case before ultimately denying the request without comment and without referring it to the whole court.

Both requests use the same basic legal argument, with the lawmakers saying the state court’s action violated the elections clause of the U.S. Constitution, which gives state legislatures the power to run elections.

Experts have said the current request for a stay is a long shot, especially because it is so similar to the previous one.

Michael Li, a redistricting expert at the Brennan Center for Justice at New York University, has said that the new request is unlikely to succeed.

“The biggest tea leaf is probably what Justice Alito did the last time when he denied the stay without even referring it to the whole court,” he said Wednesday. “Republicans are essentially making a variant of the same argument, so unless Justice Alito has changed his mind, it’s hard to see how you get five votes for a stay — and he may even decide again that this is not something that even needs to go to the whole court.”

Richard L. Hasen, a law and political science professor at the University of California, Irvine, also has said the latest challenge before Alito is almost identical to the previous, unsuccessful one.

Hasen said it remained unlikely that Alito would grant the request, calling it a “very, very long shot.”

Gov. Tom Wolf, a Democrat, plans to file a response with other executive branch participants in the case, a spokesman said.

The Pennsylvania Supreme Court, which has a Democratic majority, struck down the prior congressional map last month on the grounds that it violated the state constitution because it was a partisan gerrymander drawn to favor Republicans. The court gave the Republican-controlled Legislature and Democratic governor less than three weeks to approve a new map, or the court said it would work with an outside expert to select one on its own.

Within days of the court’s announcement that it intended to impose a new map, Scarnati and Turzai filed their first legal challenge in the U.S. Supreme Court. Their second challenge was submitted Feb. 21, just two days after the state Supreme Court handed down the new map, and was officially docketed this week.

Election analysts have said they expect Republicans would still have a slight advantage under the new maps, but not as wide an advantage as they had under the earlier maps, which resulted in a 13-5 Republican majority in every congressional election since it was enacted in 2011.