investigators. it woulden clupd the mi einclud fbi, d.c. police force. among others. they all knead how to work together. certainly elt would be awful if they worked independently. let s talk about the challenges, in the investigation. joining us michael chertoff, served as secretary of homeland security, he is chairman of the chertoff group, a global security firm. and maryellen o toole, a former fbi special agent and senior pro timer. cnn law enforcement analyst, tomful. tom fuentes. michael chertoff, coordinating the investigation. you ve speak as former secretary of homeland security will not be given easy given all the various agencies involved though the fbi is the lead agency. take us a little bit behind the scenes, how this will unfold?