Chelsea Manning is serving a 35-year prison sentence on espionage charges and other offenses for passing along 700,000 secret documents, including diplomatic cables and military intelligence files, to anti-secrecy website WikiLeaks in the largest-scale leak in US history.
"I understand that my actions violated the law. However, the concerns that motivated me have not been resolved," the soldier formerly known as Bradley Manning wrote in a New York Times editorial.
President Barack Obama said this week he was "looking at all the options" to halt the offensive that has brought militants within 80 kilometres of Baghdad's city limits, but ruled out any return of US combat troops.
Obama has been under mounting fire from Republican critics over the swift collapse of Iraq's security forces, which Washington spent billions of dollars training and equipping before pulling out its own troops in 2011.
"Military and diplomatic reports coming across my desk detailed a brutal crackdown against political dissidents by the Iraqi Ministry of Interior and federal police, on behalf of Prime Minister Nuri Al-Maliki. Detainees were often tortured, or even killed."
Manning, a former US Army intelligence analyst, said he was "shocked by our military's complicity in the corruption of that election. Yet these deeply troubling details flew under the American media's radar.
