ANNAPOLIS, Md. (AP) — A Maryland judge ruled Friday that the state’s new congressional map is unconstitutional, the first Democratic-drawn map to be struck down by a court this redistricting cycle in what the judge called a “product of extreme partisan gerrymandering.”

So far courts have intervened to block maps they found to be GOP gerrymanders in North Carolina, Ohio and Pennsylvania, infuriating Republicans and leading conservatives to push for the U.S. Supreme Court to limit the power of state courts to overturn maps drawn by state legislatures.

Judge Lynne Battaglia gave state lawmakers until Wednesday to come up with a new congressional map plan.

Battaglia, a retired judge from state's highest court who was assigned the case in Anne Arundel County Circuit Court, issued the ruling after a trial last week in which Republican lawmakers contended that Maryland's congressional map approved by the General Assembly in December violates the constitution by drawing districts that favor Democrats, who control the legislature.

She found that testimony in the case supported the argument that “the voice of Republican voters was diluted and their right to vote and be heard with the efficacy of a Democratic voter was diminished.”

“The limitation of the undue extension of power by any branch of government must be exercised to ensure that the will of the people is heard, no matter under which political placard those governing reside. The 2021 Congressional Plan is unconstitutional, and subverts that will of those governed,” Battaglia wrote.

Battaglia has a long history in Maryland's legal community. She served as a member of the state's highest court from 2001 to 2016. She served as Maryland's U.S. attorney from 1993 to 2001. She also was chief of staff to former Maryland Sen. Barbara Mikulski, a Democrat, from 1991 to 1993.

An appeal by the state is almost certain. Raquel Coombs, a spokeswoman for the attorney general, said the office is reviewing the decision.

Maryland Senate President Bill Ferguson and House Speaker Adrienne Jones, who are both Democrats and members of the panel that first approved the map, said they believed the new districts upheld the letter of the law by enacting fair boundaries that reflect demographic shifts in the state.

“We respect the diligence put into the trial judge’s determination and we will review the court’s order that establishes brand new legal standards for the drawing of the Maryland Congressional map,” Ferguson and Jones said in a joint statement.

In Maryland, where registered Democrats outnumber Republicans 2-1 and Democrats hold a strong majority in both chambers of the legislature, the GOP has long criticized the map as one of the most gerrymandered in the nation.

“Judge Battaglia’s ruling confirms what we have all known for years — Maryland is ground zero for gerrymandering, our districts and political reality reek of it, and there is abundant proof that it is occurring,” said Doug Mayer, a spokesman for Fair Maps Maryland.

The ruling comes under the unusual circumstances of Maryland having a Republican governor in a redistricting year. Gov. Larry Hogan, who has long sought reforms to the way the state draws political boundaries, created a separate commission to draw maps for the state's congressional seats and state legislative districts in hopes of taking politicians out of the process of drawing districts.

Hogan submitted the maps to the General Assembly, but the legislature moved forward with maps approved by a separate panel that included top legislative leadership, including four Democrats and two Republicans.

Hogan vetoed the map approved by the legislature in December, saying it made “a mockery of our democracy.” The legislature overrode the veto the same day. After the judge's ruling, the governor called on lawmakers to approve the map submitted by the commission he supported.

“This is an historic milestone in our fight to clean up the political process in our state, and ensure that the voices of the people we are elected to serve are finally heard," Hogan said in a statement.

If the case comes before the Maryland Court of Appeals, the state's highest court, all but one of the serving judges have been appointed by Hogan.

Chief Judge Joseph Getty last week delayed the state's primary from June 28 to July 19, as courts weigh challenges to the state’s new legislative map as well as the congressional map.

At trial last week, a witness for Maryland Republicans testified that partisan considerations took over when Democrats drew the map. Democrats currently hold a 7-1 advantage over the GOP in the state's eight U.S. House seats. The new map made the district held by lone Republican Rep. Andy Harris more competitive for a Democrat to potentially win.

The trial involved two lawsuits. One was brought by a group of Republican state lawmakers backed by Fair Maps Maryland. The other was brought by the national conservative activist group Judicial Watch.

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This version corrects that judge has give the legislature until Wednesday instead of Thursday to come up with new map plan.

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Nicholas Riccardi contributed from Denver.

Brian Witte, The Associated Press