US President Barack Obama has said Congress made a “mistake” by overriding his veto and pushing through a bill that allows legal action against Saudi Arabia over the 9/11attacks.
He said the bill would set a “dangerous precedent” for individuals around the world to sue the US government.
Wednesday’s vote was the first time Mr Obama’s veto power was overruled.
CIA Director John Brennan agreed that the bill carried “grave implications” for national security.
“The downside is potentially huge.”
The Justice Against Sponsors of Terrorism (JASTA) legislation opens the door for victims’ families to sue any member of the Saudi government suspected of playing a role in the 9/11 attacks.
Fifteen of the 19 hijackers were Saudi nationals, but the oil-rich kingdom – a key US ally – has denied any role in the attacks, which left nearly 3,000 people dead.
While US intelligence raised suspicions about some of the hijackers’ connections,the 9/11 commission found no evidence that senior Saudi officials, or the government as an institution, had funded the attackers.