legal analyst and former justice department counterterrorism attorney carrie cordero. this investigation has gone international. cnn has learned the suspect was known to british security services. had been the subject of an investigation in 2020, yet he was able to clear vetting and legally arrive in the u.s. is this a screening failure by the u.s.? well, i think, jake, that s going to be one of the big questions that u.s. investigators are going to have to evaluate. we have systems in place, primarily the entire infrastructure that was put in place in the post-9/11 era. we have a national counterterrorism center, a terrorist screening center run by the fbi and national vetting center run by the department of homeland security. these are the institutions that are supposed to catch things like this. i think that absolutely will be part of the review. it s one of the big questions that i have in terms of how this individual was permitted to enter the united states. british counterter