what we don't know is what type of mitigation for this type of threat was put in place by the secret service. i think you have to think about the way that they conduct their protective, both advances and operations. it's really with a multi-layered approach where there's no single point of failure. so what we don't know is what type of armored vehicle was she in. any type of electronic countermeasures put into place? and then the general tactics that secret service agents deploy when arriving to sites to literally mitigate this type of risk exposure because it is -- in the trade it's alcalled the d of the deadly diamonds. the secret service is aware of how to protect that arrival point. >> we're looking at video as you were discussing there, jonathan, of actions on january 5th. it's believed that this pipe bomb was put there the night before. so it would have been in place