The US military held WikiLeaks suspect Bradley Manning under strict “suicide watch” partly because his gender identity struggle showed he was mentally “not stable”, a witness said.

The 24-year-old Manning, a former army intelligence analyst in Iraq, is accused of the biggest intelligence leak in American history for allegedly passing a massive trove of classified documents to Julian Assange’s anti-secrecy website.

Prison authorities displayed ‘intolerance and homophobia’ in their treatment of Manning

Manning’s purported gender struggle came up at a pretrial hearing as his defence urged a military judge to dismiss the case, citing alleged “unlawful punishment” endured by the soldier during nine months of solitary confinement.

Master Sergeant Craig Blenis, who served as a counsellor at the Quantico military base where the WikiLeaks suspect was detained, said the gender issue “on top of other things” was a factor that determined his detention status.

It “shows he’s not stable,” Blenis told the court, explaining why Manning was put under stringent “prevention of injury” status at the Virginia base.

The subject of Manning’s alter ego, Breanna, first arose in hearings last year. In court documents, the defence argues that prison authorities displayed “intolerance and homophobia” in their treatment of Manning, now aged 24.

The defence has sought to portray brig commanders as running roughshod over psychiatrists’ advice and bowing to pressure from top brass to keep Manning in solitary confinement.

Blenis was pressed on why he recommended that the army private remain under harsh, maximum custody despite filing reports that described him as a model detainee. In a video presented to the court, Blenis was seen speaking to Manning through prison bars, telling him that he is a trouble-free inmate: “I wish I had a 100 Mannings.”

In the video, Manning can be seen standing naked from the waist up, with his arms behind him – prison authorities forced him to strip at night as part of the prevention of injury (POI) regime.

The defence also confronted Blenis with an e-mail that shows him joking with his commanding officer about a possible birthday package addressed to Manning that the Quantico jail rejected because it had not been cleared in advance.

Blenis and another counsellor, Staff Sergeant Ryan Jordan, said Manning’s reluctance to engage in conversations with troops overseeing his detention caused concern, particularly because the accused admitted to having suicidal thoughts upon arriving at Quantico in July 2010.

They said Manning posed a risk of harming himself because he had fashioned a noose from a bedsheet while confined in Kuwait, and had admitted to “always planning and never acting” on suicidal thoughts, according to a written statement when he arrived at Quantico in July 2010.

Manning was held at Quantico until April 2011 before being transferred to a prison at Fort Leavenworth, Kansas, where authorities concluded he was not suicidal and could be held under more lenient conditions.

If convicted on all 22 counts, Manning could spend the rest of his life in prison. His trial has been pushed back to March 2013 instead of February.

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