NEW : Defense Secretary Bush : Leaks should stop , because they might jeopardize probe . Medical school classmates : CNN 's Brian Todd and Ed Lavandera contributed to this report . Hasan espoused Islamist views in class . He said his allegiance was to Sharia law , not the Taliban , source says . Hasan charged with murder , accused of killing 13 at Fort Hood last year .
NEW : Defense Secretary Bush : Leaks should stop , because they might jeopardize probe . Medical school classmates : Hasan espoused Islamist views in class . He said his allegiance was to Sharia law , not the Taliban , source says . Hasan charged with murder , accused of killing 13 at Fort Hood last year .