. >> i'm scott pelley.hose stories and more, tonight, on "60 minutes." ( ticking ) this year you got it done. now walmart can help check off your gift list with free curbside pickup, fast delivery from your walmart store, or gifts shipped right to your door. let's end the year celebrating. ♪ and michalea g writes... one taste and you'll discover, what coffee is meant to be. nespresso vertuo whatbefore we talk aboutbe. tax-s-audrey's expecting... new? -twins! ♪ we'd be closer to the twins. change in plans. at fidelity, a change in plans is always part of the plan. walmart makes it easy with groceries, gadgets, and soo much icing. let's end the year deliciously. ♪ >> scott pelley: as president- elect biden begins to engage the world, one of his most challenging relationships will be with saudi arabia. the oil kingdom and ally against iran has a dismal record on human rights-- even in the united states. case in point, 15-year-old fallon smart of portland, oregon. she was killed in a hit and run by a saudi stud

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scott pelley with 60 minutes, you know who i'm talking about. mmm. "you know, you've got the greatestjob on earth, saving people all over the world." and i said, "scott, i really do." i said, "but i will say something that you hadn't thought of that's going to bother you." and he looked at me like, "what could that be?" and i said, "i don't go... go to bed at night thinking about the children we save. i go to bed at night weeping over the children we couldn't save." and i said, "when we don't get enough money, we have to choose which children eat, which children don't eat." i said, "how would you like thatjob?" it's easy to get hopeless, but we can't do it. we owe it to these children around the world. to the world food programme. thank you very much. thank you, stephen. hello. in comparison to recent mornings, thursday gets off to a relatively mild to start but not very inspiring skies for the majority first thing. a lot of cloud around, gloomy, and we will be stuck with that cloud in many areas throughout the course of the day. it's courtesy of an

pelley now and there's nothing else you can do about it. well i think the assassination of more sent factories or that the iranian nuclear scientists was a major red line did these raby crossed when the nuclear deal was being signed by the rowhani administration there was a lot of critics in iran saying that it would not improve the conditions of the country in today iran is part of the deal but it is being sanctioned even worse than before the deal and its nuclear scientists are getting killed by the israelis so either iran has to respond militarily in that can get out of hand and it can be escalate into an actual war or the other path would be to sign this new bill in expand your arms nuclear activities and mind you this is being done by the conservative parliament which is very critical of the j.c.b. away you've also got elections coming up in 7 months time in iran that's going to have an impact as well i want to bring in washington d.c. here and jim all the easiest thing that joe biden could do is basically go back to the j.c. would see

election and the years long government wide effort to ensure it was safe and accurate with scott pelleys election because i know the work that we've done for four years in support of our state and local partners. i know the work that the intelligence community has done, the department of defense has done, the fbi has done, my team has done. i know these systems are more secure. i know based on what we've seen that any attacks on the election were not successful. >> two years ago, president trump put christopher krebs in charge of the new cyber security and infrastructure security agency. krebs, a life long republican, was confirmed unanimously by the senate. his agency, known by its acronym cisa helped secure computer systems, nuclear power plants for example, and the election hardware in all 50 states. why are you speaking to us? >> i'm not a public servant anymore, but i feel i've still got some public service left in me. and, you know, it's hard once you take that oath to uphold and defend the constitution from threats foreign and domestic. it's hard to walk away from that. and if i

. >> each one of these homes, mount pelley, a -- they are wonderful for bringing children to them. they have so many child friendly programs. my kids have suffered through need dragging them to all of these places. when we were in the green room earlier, and the vice president and i were talking, i always knew that he was a great military and civil war buff, do you share his enthusiasm for visiting the revolutionary civil war and various civil rights battlefields in the country? is that something you discuss? >> now. but dick has made the lives of our children richer. when we first moved to virginia, those many years ago, they were little. dick loved the idea of being in the middle of all the battlefields. he would get them up every saturday morning and take them to a battlefield. still, one morning he tried and i said no more battlefields. so frankly, i don't have much geographical sense. to understand happened you really do need to know north and south. >> sure. >> of all the books you've written, we've talked about several, was there one that was the most difficult and challengi