His presentations for school were often laced with extremist Muslim views, one source said.

“Is your allegiance to Sharia law or the United States?” students once challenged Hasan, the source said.

“Sharia law,” Hasan responded, according to the source.

The incident was corroborated by another doctor who was present.

The source recalled another instance in which Hasan was asked if the U.S. Constitution was a brilliant document. Hasan replied, “No, not particularly,” according to the source.

The former classmate told CNN that he voiced concerns about Hasan to supervisors at the school…

The second classmate said he witnessed at least two of Hasan’s PowerPoint discussions that included what he described as extremist views.