A winding trail through Muir Woods National Monument.

The Sierra Club has filed a new lawsuit against the Donald Trump administration over its efforts to find and remove displays across public lands that spotlight troubling chapters of American history.

In March, the Trump administration ordered national parks and other federally managed sites to display signs encouraging visitors to report exhibits that “inappropriately disparage Americans past or living,” leaving historians and advocacy groups scrambling to document interpretive signs that might be slated for removal.

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The lawsuit centers on the administration’s failure to turn over records related to that directive. According to the Sierra Club, the organization filed Freedom of Information Act requests on July 31, seeking documents from the Department of the Interior and several land-management agencies detailing how the administration ordered reviews of signs, websites and other public-facing materials on federal lands.

The Sierra Club’s records requests sought to uncover how the Interior Department is implementing the directive. The nonprofit asked for copies of public comments submitted through QR codes posted at parks and historic sites, internal guidance, and criteria used to determine which exhibits and language were deemed “inappropriate” and records showing which signs, webpages or other materials have been altered, removed or replaced.

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