A U.S. State Department official is set to testify on Monday about how much convicted soldier Bradley Manning's leaks of classified diplomatic cables to the WikiLeaks website hurt ties between Washington and its allies as well as global intelligence-sharing methods.

Judge Colonel Denise Lind on July 30 found Army Private First Class Bradley Manning, 25, guilty of 19 criminal counts related to the leaks, the largest unauthorized release of secret U.S. data in the nation's history.

Manning was found not guilty of aiding the enemy, the most serious charge he faced, but the crimes still carry penalties that could lead to up to 136 years in prison.