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A military judge blocked several key pieces of evidence Monday that prosecutors said would explain the mindset of the soldier accused in the 2009 shooting rampage at Fort Hood, including his belief that he had a “jihad duty” to carry out the attack.

Prosecutors had asked the judge to approve several witnesses and various evidence to support what they allege motivated Maj. Nidal Hasan to carry out the attack, which killed 13 people and wounded more than 30 others at the Texas military base.

But the judge, Col. Tara Osborn, blocked nearly all of it.

Osborn barred any reference Hasan Akbar, a Muslim soldier sentenced to death for attacking fellow soldiers in Kuwait during the 2003 invasion of Iraq. Prosecutors wanted to suggest that Hasan, an American-born Muslim, carried out a “copycat” attack.