Given that any new 9/11 enquiry granted by this or any other adminiistration will be a fix we have to take another approach.
The 9/11 argument has been adversarial from day one so let us conclude it in the same way.
The American way- In court.
First we set up two investigative panels . One composed of Truth advocates and one of government supporters. Both having full powers of subpoena. The Truth panel could be led by David Ray Griffin, Steven Jones , Kevin Ryan, Bob Bowman and their choice of other members up to say 15 or so. The governement panel could be composed of whoever they liked....I would suggest the original 9/11 commission members myself.
Then they could could start their seperate gathering of data, calling witnesses under subpoena and accessing documentation and material evidence the same way. Gagged witnesses would be ungagged at will.
The two teams of lawyers wold be fully abreast of all developements and could soon move into the familiar court setting. Here all witnesses would be heard in public- in fact everything should go out on live National TV for the duration of the case. No closed sittings.
There should be several people with camcorders following events and posting videos daily on the internet.
In this way a fair investigation is guaranteed.