know. is it possible these things are a foreign adversarial technology that somehow was developed in secret and we are just now trying to figure these things out? it's possible. but, there is also other possibilities as well of what these things could be. >> tucker: right. i mean, that would be the terrestrial explanation. assign a likelihood of that being the case? >> boy, tucker, you don't want me to give my opinion. the one thing i learned in intelligence, you can be absolutely sure of something and be absolutely wrong. >> tucker: of course. it's happened to me many times. it sounds, i guess, just as sort to put a bow on it. >> a low probability. >> tucker: that's it? >> very low probability. look, we have the most sophisticated weapon systems right now on the face of the planet. we can identify not only a 737 or a meg 25 or f-22 we can tell you even what airline it is. and the difference between the models of aircraft within that type of aircraft. so, i think it's highly unlikely that a foreign