our scott pelley sat down with outgoing fbi director christopher wray for tonight's "60 minutes" and talked to him about the challenges facing the new national security team. here is a preview of scott's interview and one threat that's been a particular concern to director wray. >> china's cyber program is by far and away the world's largest, bigger than that of every major nation combined, and has stolen more of americans' personal and corporate data than that of every nation big or small combined. but even beyond the cyber theft, there is another part of the chinese cyber threat that i think has not gotten the attention publicly that i think it desperately deserves and that is chinese government's prepositioning on american civilian critical infrastructure. to lie in wait on those networks, to be in a position to wreak havoc and can inflict real world harm at a time and place of their choosing. >> the chinese have already insinuated malware into critical american infrastructure? >> that's correct. >> like what? >> things like water treatment plants, we're talking about transportatio

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before i get to those confirmation hearings, i want to follow up on what the fbi director told our scott pelleye of the chinese hacking and what incoming national security adviser was called cyber time bombs throughout u.s. infrastructure. what needs to happen? what are the consequences need to be for china having done this and remaining in our infrastructure? >> well, we have to be strong in standing up to them and explaining to them and, in some cases, i think, consequences need to be serious. there are things that we can do. we have the tools. but i would say even beyond that we have to figure out a way to get them off of the infrastructure. with regards to the telecom system, multiple companies, chinese, cyber software, are currently on those systems and we're working to try to fix this. some of this is going to require that the telecom companies upgrade their infrastructure that could be costly. we're working with them to do that. >> it's pretty incredible that this espionage happened in the first place and expelling them is so hard to do. i want to also ask you about another chinese quest