HARRISBURG, Pa. (AP) — Republican leaders of the Pennsylvania Legislature on Wednesday asked the U.S. Supreme Court to block a new congressional district map that is widely considered likely to give Democrats a boost in their quest to capture control of the U.S. House.

House Speaker Mike Turzai and Senate President Pro Tempore Joe Scarnati said the state’s highest court usurped legislative authority when it issued the new map on Monday, calling it an unprecedented decision.

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“The Pennsylvania Supreme Court conspicuously seized the redistricting process and prevented any meaningful ability for the Legislature to enact a remedial map to ensure a court drawn map,” they wrote in an electronic filing.

The challenge adds uncertainty as candidates are preparing to circulate nominating petitions to get their names on the May primary ballot.

A spokesman for Democratic Gov. Tom Wolf, responding to the lawmakers’ filing, said Wolf was “focused on making sure the Department of State is fully complying with the court’s order by updating their systems and assisting candidates, county election officials and voters prepare for the primary election.”

Republicans said a separate challenge to the map in federal court in Harrisburg is also possible this week.

The Democratic majority on the state Supreme Court in January threw out a 2011 congressional district map that had been drafted by Republicans, saying it violated the state constitution’s guarantee of free and equal elections.

It is the third time in four months that Turzai and Scarnati have asked the U.S. Supreme Court to put a halt to litigation over the 2011 map they took leading roles in producing. The 2011 version has been called one of the nation’s most gerrymandered congressional maps.

In November, Justice Samuel Alito turned down a request for a stay of a federal lawsuit, a case that Turzai and Scarnati won in January.

On Feb. 5, Alito rejected a request from Turzai and Scarnati to halt a Jan. 22 order from the state Supreme Court that gave the Republican leaders two weeks to propose a map that would be supported by the Democratic governor and until last week to suggest a new map to the court.

The application filed Wednesday also was addressed to Alito.

Turzai and Scarnati argued that the state’s high court gave them scant time to propose their own map after throwing out the 2011 version, ensuring “that its desired plan to draft the new map would be successful.” As evidence of a “preordained plan,” they cited comments critical of gerrymandering made by Justice David Wecht during his 2015 campaign for the court.

“The court’s process was entirely closed,” they told Alito. “It did not allow the parties the opportunity to provide any comment to the proposed map, inquire on why certain subdivisions were split and whether it was to meet population equality, or further evaluate whether partisan intent played any role in the drafting.”

As a sign of the litigation’s potential impact on national politics, President Donald Trump on Tuesday urged Republicans to press their challenge of the map to the U.S. Supreme Court.

“Your Original was correct! Don’t let the Dems take elections away from you so that they can raise taxes & waste money!” Trump tweeted.

The five Democrats on the state Supreme Court sided with Democratic voters who challenged the map, although one of the Democratic justices, Max Baer, has pointedly opposed the compressed timetable.

Republicans who controlled the Legislature and the governor’s office after the 2010 census crafted the now-invalidated map to help elect Republicans. They succeeded in that aim: Republicans won 13 of 18 seats in three straight elections even though Pennsylvania’s registered Democratic voters outnumber Republicans.

An analysis conducted through PlanScore.org concluded the court’s redrawn map eliminates “much of the partisan skew” favoring Republicans on the old GOP-drawn map, but not all of it.

Congressional candidates have from Feb. 27 to March 20 to collect and submit enough signatures to get on the ballot, and the new district maps have candidates and would-be candidates scrambling to decide whether to jump in. Five incumbents are not seeking another term and a sixth has resigned, an unusually large number of openings.