A federal judge on Friday temporarily blocked the National Park Service from removing or revising signs, films and other materials at national parks across the country to comply with a directive from President Trump.
The ruling pauses enforcement of an executive order that called for removing or covering up materials at national parks that “inappropriately disparage Americans” or cast the United States “in a negative light.”
The judge, Angel Kelley of the U.S. District Court for the District of Massachusetts, also ordered the Park Service to restore within three weeks any exhibits that it had dismantled or altered.
The ruling provides a temporary reprieve for the plaintiffs, a coalition of advocacy groups that sued over the executive order in February, while the litigation continues to unfold.
To comply with the president’s directive, the Park Service has taken down plaques about slavery at Independence National Historical Park in Philadelphia, a sign about climate change at Fort Sumter in South Carolina and a sign about Indigenous people at Acadia National Park in Maine.
Another federal judge has already ordered the Park Service not to make further changes to the slavery exhibit at the President’s House Site at Independence National Historical Park, as she considers a separate lawsuit filed by Philadelphia.
Judge Kelley, who was nominated by President Joseph R. Biden Jr., sharply rebuked the Trump administration for taking down materials. “Not only does this undermine the integrity of the national parks; it sets a dangerous precedent of censorship and sanitization,” she wrote.
Judge Kelley began her 63-page ruling by listing examples of national parks that help educate visitors about difficult periods of American history, as well as contributions made by people of color, gay and transgender figures, women and other marginalized groups.
“From the echoes of abolition in John Brown’s Fort in Harpers Ferry, to the genesis of the modern L.G.B.T.Q.+ civil rights movement at the Stonewall National Monument, to the retreating ice of Glacier National Park in Alaska, the national parks preserve the multifaceted and multilayered history of our nation, including the good, the bad and the ugly,” she wrote.
In the lawsuit, the plaintiffs argued that removing the materials was “arbitrary and capricious,” in violation of the Administrative Procedure Act. They also accused the Park Service of exceeding its legal authority.
Katie Martin, a spokeswoman for the Interior Department, the parent agency of the Park Service, suggested that the administration would appeal the ruling.
“This ruling is from a liberal activist judge,” Ms. Martin said in an email. “The department will look at our appeal options while we celebrate U.F.C. Freedom 250 on the South Lawn of the White House this weekend in honor of our nation’s 250th with the greatest president in the history of our country — President Donald J. Trump.”
Emily Thompson, the executive director of the Coalition to Protect America’s National Parks, one of the advocacy groups that brought the lawsuit, applauded the ruling.
“National parks are not propaganda tools, nor should they be used for partisan purposes,” Ms. Thompson said in a statement. “They exist to preserve and interpret the full American story, not just the parts that make some politicians comfortable. This ruling is an important step to help ensure that remains the case.”
In an email sent after the ruling, a copy of which was reviewed by The New York Times, a Park Service official directed regional supervisors to pause carrying out Mr. Trump’s directive “for the time being.”
“Parks can continue to submit items for review, but implementation actions should pause pending further guidance,” the email said.