downed drone. he left it to bolton, who said no one should confuse prudence for weakness and left open the possibility that there may be a strike coming in the future if iran doesn't change its actions, apparently leaving an open-ended threat. and bolton concluded his remarks by saying, stay tuned. >> he seemed to pause before he said that, for effect. thank you. let's go to fred. tensions, fred, remaining high as president trump tightens the economic noose and iran saying they will not back down if provoked. how is this new threat from john bolton likely to go down? >> reporter: well, certainly not very well. i think one of the things the iranians have been saying is they believe that, for instance, the program of maximum pressure by the united states government, the sanctions that were put on iran after the u.s. left the nuclear agreement. obviously, that continued to be more. they view that as an aggression against iran rather than the other way around. also the fact that the u.s. is