DHS Secretary Janet Napolitano is coming under fire for the failures that allowed Umar Farouk Abdulmutallab to smuggle explosive material onto a Christmas Day flight. Specifically, warnings from Abdulmutallab's father to the US some months earlier, that his son might be dangerous, were apparently ignored.
Unfortunately, the terrorist's father chose the ignominious career path of 'Nigerian Banker'. Napolitano had simply fallen for that old Nigerian Banker email scam one too many times. She had to draw the line somewhere. ;-)