probably three of the most significant and toughest national security advisers in our industry, henry kissinger, dru just made my mother very happy. >> thank you for coming. are you feeling okay? >> yes. there's no pain. i wanted to tell people, my wife and i were sitting at the kitchen table and i offhandedly mentioned i was saying maybe i would go into politics again and the next thing i knew i woke up in the e.r. >> you served the country for so long, how nice is it to again be a private citizen? >> it's terrific and it's even better to live an entire continent away from washington. >> what if you're asked back? >> i think after this book, there is zero chance of that. >> so that's why he wrote the book. >> thank you so much for everything and for your service. former secretary of defense robert gates. up next, senator john thune will join us. you're watching "morning joe." we'll be right back. [ male announcer ] what if a small company became big business overnight? ♪ like, really big... then expanded? ♪ or their new product tanked? ♪ or not? what if they embrace new technology instead? ♪ imagi