Doonesbury by Garry Trudeau for March 30, 1974
Transcript:
Nixon: Let me just say this, citizens of Fritters: the President of the United States is not a quitter! Mark: You know, I heard a rumor that the President's speechwriters are actually working him up to an "ill health" resignation... Nixon: Yes, I am going to stay on the job I was elected to do, as long as my vital signs remain acceptable to the team of medical specialists standing by on 24 hour alert! Mike: Good rumor.
Did “to spend more time with my family” come later?