Should defense lawyers in the September 11 terrorism case be allowed to visit the secret camp where their clients are imprisoned at Guantanamo Bay? And if so, how much access to the prison is enough?

It was another chaotic day at the Guantanamo military commissions. When Khalid Sheikh Mohammed's lawyer started talking this afternoon about his request for information pertaining to his client's case, someone -- it's not clear who -- hit the censor button.

In an opinion not yet publicly released by the Office of Military Commissions, the judge presiding over the trial of the five co-defendants accused of masterminding the September 11, 2001 terrorist attacks has said he won't decide whether the U.S. Constitution applies to the case.

Defense lawyers aren't told what evidence is classified, need the prosecution's approval to call witnesses, and have to defend their clients in a commission that may have been unlawfully influenced by senior U.S. officials, they told the Guantanamo court.

The definition and use of classified information, and the public's right to hear it, is proving to be one of the most important issues arising in pre-trial hearings in this historic September 11th terrorism prosecution.