Bradley Manning diagnosed with gender identity disorder by army psychologist in Iraq in 2010

FORT MEADE, Md. - An Army psychologist says Pfc. Bradley Manning's private struggle with his gender identity in a hostile workplace put incredible pressure on the soldier.

Capt. Michael Worsley testified Wednesday at Manning's sentencing hearing at Fort Meade, near Baltimore.

Manning eventually came out to the therapist and emailed Worsley a photo of himself dressed as a woman.

Manning's lawyers contend that Manning showed clear signs of deteriorating mental health that should have prevented commanders from sending him to a warzone to handle classified information.

Defense attorney David Coombs says Manning will take the stand during the sentencing phase of his court-martial Wednesday at Fort Meade near Baltimore.

Coombs says it's up to Manning whether he will testify as a witness, or make a sworn or unsworn statement. An unsworn statement cannot be cross-examined by the prosecution.

The witness list also includes a mental health expert and Manning family members, including his aunt Debra Van Alstyne.

Manning faces up 90 years in prison for leaking reams of classified information to WikiLeaks while working as an intelligence analyst in Iraq in 2010. He claims he wanted to expose wrongdoing and provoke public debate about the U.S. military and diplomatic affairs.