Congress is expected to come a step closer Wednesday to its first override of a veto from President Obama.
At issue: whether families of Sept. 11 victims can sue the Saudi Arabian government. Some survivors and victims' families believe the Saudi government played a role in the terrorist attacks. Most of the hijackers were Saudi citizens.
The legislation would allow individuals to sue any foreign country for a role in terrorism on the United States' land. Foreign countries currently have immunity from lawsuits in the U.S.
"If we open up the possibility that individuals in the United States can routinely start suing other governments, then we are also opening up the United States to being continually sued by individuals in other countries," Obama told CBS in April.
Families and survivors have said the bill would "deter terrorism and hold accountable those nations that support and fund it."
Both houses of Congress need a two-thirds vote to successfully override a presidential veto.
An overwhelming number of legislators on both sides of the aisle have voiced their support for the override.