The amendment, S.A. 2669, to the Commerce, Justice, Science and Related Agencies Appropriations Act, would have forced the government to try the suspected plotters of the 9/11 attacks in military commissions. The Obama administration opposed the amendment, but still has not announced where it wants to try the 9/11 suspects.

The Graham amendment is expected to come to a vote today during consideration of the Commerce/Justice/Science appropriations bill. The earlier Homeland Security and Defense Department spending bills already include restrictions on transferring Guantanamo detainees to the United States.

This restriction, which is reportedly backed by 150 family members of victims of the 9/11 attacks, would bar the trials of the alleged 9/11 plotters in civilian federal courts, effectively forcing them to be tried by military commissions.

The Obama administration has suggested that it wants to try the 9/11 suspects in federal court, and so far has fought to retain the power to decide where the terror suspects will be tried. Last week, Defense Secretary Robert Gates and Attorney General Eric Holder warned Senate leaders that Graham’s amendment “would be unwise, and would set a dangerous precedent.”

The administration has said it will begin announcing where it wants to try the terror suspects held at Guantanamo Bay by November 16.