As I look back at those days I am impressed by the way in which President Nixon continued to perform his duties in what was surely a time of great stress for him.
The job duties required of the President of the United States are very stressful.
mnli hypothesis: The job duties required of the President of the United States are very stressful. premise: As I look back at those days I am impressed by the way in which President Nixon continued to perform his duties in what was surely a time of great stress for him.