WASHINGTON  — Democrats and Republicans are vowing to decisively override President Barack Obama’s veto of a bill to allow families of Sept. 11 victims to sue the government of Saudi Arabia for the kingdom’s alleged backing of the terrorists who killed nearly 3,000 people.

Obama rejected the bill Friday, warning of a host of unintended and severe consequences if it were enacted. The legislation, according to Obama, could leave American troops and diplomats overseas vulnerable to lawsuits in foreign courts from people seeking redress for actions taken by armed groups that are backed or trained by the United States.

The bill’s proponents disputed Obama’s rationale, arguing the measure is narrowly tailored and applies only to acts of terrorism that occur on U.S. soil.

“This is a disappointing decision that will be swiftly and soundly overturned in Congress,” said Sen. Chuck Schumer, D-N.Y., who sponsored the bill. “If the Saudis did nothing wrong, they should not fear this legislation. If they were culpable in 9/11, they should be held accountable.”

Sen. John Cornyn, R-Texas, another of the bill’s sponsor, criticized Obama for failing to listen to the families of the victims and said he looked forward to the opportunity for Congress to override the vet