A pretrial military hearing for accused Army whistleblower Private Bradley Manning is entering its fifth day. Manning has been held for the past 19 months for allegedly leaking classified videos and diplomatic U.S. cables to the website WikiLeaks. On Monday, military prosecutors claimed they had discovered what they believe is email correspondence between Manning and Julian Assange, the founder of WikiLeaks. In one letter, Manning reportedly wrote, “This is possibly one of the more significant documents of our time. Removing the fog of war and revealing the true nature of 21st century asymmetrical warfare.” In an email to another individual, Manning reportedly took credit for leaking a video that showed a U.S. helicopter gunship killing a group of Iraqi men, including two employees of Reuters. Monday’s hearing had other dramatic moments. The nation’s most famous whistleblower, Daniel Ellsberg, was temporarily removed from the hearing after he attempted to speak to Bradley Manning. Former Army Lt. Dan Choi, a supporter of Bradley Manning, was also forcibly ejected from the base. If convicted, Manning could face life in prison.