Nightly News | August 24, 2011
>>> president dick cheney wrote a secret letter of resignation that was kept hidden away from the earliest days of the bush administration . cheney has a book coming out and spoke exclusively to nbc news.
>> i was concerned for a couple of reasons, one was my own health situation , the possibility they might have a heart attack or a stroke that would be incapacitating and there was no mechanism, there is no mechanism for getting rid of a vice president who can't function.
>> and you'll be able to see more of that interview on a special edition of "dateline" on monday at 7:00 eastern time .