A new filing in a lawsuit brought by the families of 9/11 victims against the government of Saudi Arabia alleges that al-Qaeda had significant, indeed decisive, state support for its attacks. Officials of the Saudi government, the plaintiffs’ attorneys contend, formed and operated a network inside the United States that provided crucial assistance to the first cohort of 9/11 hijackers to enter the country.

The 71-page document, released in redacted form earlier this month, summarizes what the plaintiffs say they’ve learned through the evidence obtained in discovery and recently declassified materials. They allege that Saudi officials—most notably Fahad al-Thumairy, an imam at a Los Angeles mosque and an accredited diplomat at Saudi Arabia’s consulate in that city, and Omar al-Bayoumi, who masqueraded as a graduate student but was identified by the FBI as an intelligence operative—were not rogue operators but rather the front end of a conspiracy that included the Saudi embassy in Washington and senior government officials in Riyadh.

Today, for most Americans, the global War on Terror has become a hazy memory from the time before Donald Trump. In Washington, policy makers avoid discussing the subject. Yet it bears remembering: It cost us $6 trillion, and that number is expected to go higher because of the long-term health-care costs for veterans. It turned the Middle East upside down, increasing the regional influence of Iran. More than 7,000 American servicemen and women died in action; 30,000 more, an extraordinary number, died by suicide. In all, more than 800,000 Iraqis, Afghans, and others, most of them civilians, perished in the war.