Several families of Sept. 11 victims joined U.S. Sen. Richard Blumenthal in Hartford Monday to demand more information about who was behind the terror attacks.

Two years ago, Congress allowed the families to sue the Saudi Arabian government, but the case has stalled because the U.S. is refusing to declassify investigative documents that could show who helped plan and pay for the attacks.

"More than 80,000 pages of unreleased documents related to the FBI's investigation of a wealthy, well-connected family in Saudi Arabia," Blumenthal says.

Brett Eagleson, the son of a Sept. 11 victim, says he wants answers for his 9-year-old nephew.

"He asks me all the time, 'Brett, what happened to Grandpa Bruce?' And I like to think I can tell him what happened, but we don't know the real answers," Eagleson says.

Blumenthal is pushing a resolution in Congress to declassify the Sept. 11 documents. Only a judge or President Donald Trump can order their release.