Manning gave an unsworn statement Wednesday, which means he cannot be cross-examined by prosecutors. He began with an apology.
He says "I'm sorry that my actions hurt people. I'm sorry that it hurt the United States."
Manning says he understood what he was doing and the decisions he made. However, he says he did not believe at the time that leaking the information would cause harm.
Manning faces up to 90 years in prison for the leaks.