The cleric,Anwar al-Awlaki, who now lives in Yemen, once taught at a mosque in Virginia that Hasan attended and is well-known among violent Islamists, according to terrorism expert and author Evan Kohlmann.

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And much of Wednesday's hearing was devoted to questioning a potential expert witness for the prosecution, Evan Kohlmann, an international terrorism expert who apparently examined the contents of a laptop belonging to Hasan.

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