In a "60 Minutes" interview, former Vice President Dick Cheney spoke to Dr. Sanjay Gupta about his 35-year struggle with heart disease. He revealed he wrote a letter of resignation in 2001 in case he was unable to complete the job due to his health. For Dr. Gupta's complete interview, watch "60 Minutes" on CBS, this Sunday.
Ex-VP Cheney wrote contingency resignation letter in 2001
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