NEW : ` ` Our job is to ... try to anticipate the next step , '' Jeh Johnson , MD . And so we continually evaluate the world situation , and we know that there remains a terrorist threat to the United States , and aviation security is a large part of that , '' Johnson told NBC 's `` Meet The Press . '' 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 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 .