Sixteen years after the 2001 terror attacks killed nearly 3,000 people, the Obama administration’s acting solicitor general on Wednesday urged the U.S. Supreme Court to block a suit against former George W. Bush officials for their alleged roles in crafting unlawful detention policies.

The resolution of the civil claims against former U.S. Attorney General John Ashcroft, former FBI Director Robert Mueller III and former immigration head James Ziglar is expected to reach beyond the facts of the case etched so many years ago.