Bingo.
Sheesh. We're at war with vicious terrorists. The guy is not being held for no reason.
You do not understand the situation. This US citizen was arrested and jailed in solitary confinement under the material witness statute. Under that statute there is no crime charged, so no Writ of Habeas Corpus will apply.
You or I may be held indefinitely - without being charge with a crime and without ever being brought before a grand jury to hear your testimony. There is no limit to how long you may be held without being brought before a grand jury and without being charged with a crime. You essentially disappear into federal custody and there is not anything you can do about it. I am not even sure if you have the right to attorney, although in this case, the man has hired a private attorney.