CNN The Lead With Jake Tapper November 6, 2015 21:08:00
Overseas but they were flights coming into the u.s. that's really where the concern is. >> reporter: u.s. officials stress there are already multiple layers of security to screen passengers before they ever get on a plane bound for the u.s., including checking all passengers and crew against the u.s. terror watch list. but vulnerabilities still exist. the insider threat is a major concern. >> employee vetting needs to be beefed up. once they hire these individuals, they need to keep continuing to vet them on a recurrent basis to make sure if they go bad during their time as an employee, we cat...