Former leaders of the National Archives — which preserves and protects the nation’s most important documents — are urging a federal appeals court to reject the Trump administration’s effort to ignore the Presidential Records Act, a decades old law that requires presidents save all official records from their time in office.

Six archivists, who served under both Republican and Democratic presidents, argue that the law is critical in maintaining “continuity of governance” and protecting national security.

The archivists — a coalition covering every living person to have previously held the role before Marco Rubio’s brief appointment to the position at the beginning of Trump’s second term — filed an amicus brief Wednesday in support of a lawsuit from presidential scholars, historians and public transparency groups.

The legal fight began after the Trump administration said it believed the president did not need to comply with decades-old record-keeping obligations set by Congress in the aftermath of the Watergate scandal. The law, which Trump’s Justice Department has claimed is unconstitutional, is intended to preserve documents so that future presidents, members of Congress, courts and the public can understand how an administration made critical decisions.