NEW : ` ` Our job is to ... try to anticipate the next step , '' Jeh Johnson , MD . TSA may require passengers en route to United States to turn on their electronics . They want to make sure the electronics work and are n't explosives . It 's part of a series of new measures aimed at addressing potential new threats overseas .
NEW : `` Our job is to ... try to anticipate the next attack , '' Jeh Johnson tells NBC . TSA may require passengers en route to United States to turn on their electronics . They want to make sure the devices work and are n't explosives . It 's part of a series of new measures aimed at combating potential new threats overseas .