(CNN) -- An arraignment is scheduled Thursday for Pfc. Bradley E. Manning, who is suspected of leaking secret documents to the WikiLeaks website.
Manning, who is also the subject of a court martial, faces charges that include aiding the enemy, wrongfully causing intelligence to be published on the Internet, theft of public property or records, transmitting defense information, and fraud and related activity in connection with computers.
If convicted of all charges, he would face a maximum sentence of life in prison, reduction to the lowest enlisted pay grade, E-1; forfeiture of pay and allowances; and a dishonorable discharge. Aiding the enemy is a capital offense, but the investigating officer endorsed the view of military prosecutors not to seek the death penalty.
Manning is accused of orchestrating the biggest intelligence leak in U.S. history. During the Article 32 proceedings in December, prosecutors presented evidence that Manning allegedly communicated with WikiLeaks founder Julian Assange in a series of Internet chats about uploading 700 Guantanamo Bay detainee interrogation reports.
Prosecutors charge that Manning put software on secure computers that allowed him to download classified material and burn it to a compact disc. Manning was assigned as an intelligence analyst in Iraq and had a top-secret clearance. He worked in a Sensitive Compartmented Information Facility (SCIF).
Manning is being held in military custody.
At an Article 32 hearing a few weeks ago, Manning's defense lawyer, David Coombs, focused most of his attention on two issues: lack of security at the SCIF and the Army's lack of response to Manning's emotional and behavior problems.
WikiLeaks, the international online group that publishes secret government documents it receives from outside sources, set off a firestorm a year and a half ago when it made public on its website U.S. diplomatic cables and other sensitive documents, most of them pertaining to the Iraq and Afghanistan wars.
The disclosure of hundreds of the documents continues to cast a shadow over the U.S. intelligence community.
Director of National Intelligence James Clapper told an information-sharing conference in January that plugging leaks of classified materials is still a challenge for the community as it develops new systems to protect information, while at the same time ensuring the right people have access to it.
The fact that Manning had access to so much secret information called into question whether the government had gone too far in responding to one of the biggest failures associated with the 9/11 terrorist attacks. The intelligence community and law enforcement were faulted for failing to share information that might have prevented the attacks.
Clapper called the WikiLeaks disclosure a "terrible event" that heightened the intelligence community's sensitivity to inside threats. He said changes have already been made to monitor information and keep track of who has access to it. But he said it is a work in progress.
"We have to do more to both tag data and ensure that we can properly identify people so that they are actually authorized to receive the information," he said.