RICHMOND (AP) — Democrats ran into a setback on Tuesday in Virginia to fight back against President Donald Trump’s congressional redistricting efforts.

A Virginia judge ruled that a proposed constitutional amendment letting Democrats redraw the state’s Congressional maps was illegal, setting back the party’s efforts to pick up seats in the U.S. House in November.

The latest development is part of a national battle over unusual mid-decade redistricting attempts, launched last summer by Trump who urged Republican officials in Texas to redraw maps to help the GOP win more seats. He did so in hopes of holding on to a narrow House majority in the face of political headwinds that typically favor the party out of power in midterms.

Tazewell Circuit Court Judge Jack Hurley Jr. struck down the Virginia legislature’s actions on three grounds, including finding that lawmakers failed to follow their own rules for adding the redistricting amendment to a special session.

His order also said Democrats failed to approve the amendment before the public began voting in last year’s general election and failed to publish the amendment three months before the election, as required by law. As a result, he said, the amendment was invalid and void.

Virginia House Speaker Don Scott, who was listed in Republicans’ lawsuit over the resolution, said Democrats would appeal the ruling.

“Nothing that happened today will dissuade us from continuing to move forward and put this matter directly to the voters,” Scott said in a joint statement with other Democratic leaders.

Virginians for Fair Elections, a campaign that supports the redistricting resolution, accused conservatives of filing their lawsuit in a known GOP-friendly jurisdiction, saying, “Republicans court-shopped for a ruling because litigation and misinformation are the only tools they have left.”

Hurley’s ruling came after lawmakers said they would unveil their proposed new districts to voters by the end of this week.

The state is currently represented in the House by six Democrats and five Republicans from districts whose boundaries were imposed by a court after a bipartisan redistricting commission failed to agree on a map after the 2020 census.

Because the commission was established by a voter-approved constitutional amendment, lawmakers have to revise the constitution in order to be able to redraw maps this year. That requires the pass a resolution in two separate legislative sessions, with a state election sandwiched in between.

Virginians would have to vote in favor in a referendum.