A bill on the President's desk that could empower families of September 11th victims to sue foreign nations like Saudi Arabia in connection with the terror attack is heading back to Congress. But, as our Lori Chung explains, advocates of the bill say they won't stop fighting.

Two days after the house passed a bipartisan bill that would allow the families of 9/11 victims to sue Saudi Arabia, comes a clear sign the measure will not clear the white house.

"The president does intend to veto this legislation," said White House spokesman Josh Earnest. "This law actually opens the United States to risks of being hauled into court in countries around the world."

The White House says that is one of the possible unintended consequences of the Justice Against Sponsors of Terror Act, which was unanimously approved by the Senate in May. Officials argue that designating state sponsored terrorism is an executive responsibility that could be undermined by the courts.

"You could have judges at different levels in different courtrooms reaching different conclusions about the same country," Earnest said.

And as the bill stokes fears it will strain relations between the two countries. Family members who support the measure are disappointed by the president's position.

"To now hear that all of hard work is going to be threatened by a potential veto, is a kick in the stomach to 2,996 thousand victims of terrorism on American soil," said Brett Eagleson, the son of a 9/11 victim.

Fifteen of the nineteen hijackers were Saudi nationals.  Advocacy groups say they should have the right to go after a country they believe helped terrorists.

"They didn't come without any help and the assistance came from the kingdom of Saudi Arabia," said Terry Strada with 9/11 Families and Survivors United for Justice Against Terrorism.

Strada lost her husband tom during the attacks and says the concerns about the bill are unfounded.

"To only hold accountable a nation that gave aid, logistical aid or financial aid to a designated terrorist organization and carried out an attack on U.S. soil that injured or killed American citizens," Strada said. "That is all this bill does."

So far, U.S. investigations have not been able to substantiate allegations that the attackers had ties to the Saudi government.

Relatives like Strada say they'll be working to get the votes of two thirds of the members in the house and the senate needed to override a veto.