Maybe he could write a similar memo to his son.
After a couple of terms as a Congressman from Texas, Bush was appointed Ambassador to the United Nations by President Richard M. Nixon. Afterwards Nixon appointed him chairman of the Republican National Committee. So Bush spent Watergate as head of the Republican party. Oddly enough, as RNC chairman Bush had an (unofficial) office inside the White House. So anyway, Bush was the guy who ultimately had to ask Nixon to resign, which he was too chicken to do face-to-face. So he wrote a memo:
"Dear Mr. President,
It is my considered judgment that you should now resign. I expect in your lonely embattled position this would seem to you as an act of disloyalty from one you have supported and helped in so many ways. My own view is that I would now ill serve a President whose massive accomplishments I will always respect and whose family I love, if I did not now give you my judgment. Until this moment resignation has been no answer at all, but given the impact of the latest development, and it will be a lasting one, I now firmly feel resignation is best for the country, best for this President. I believe this view is held by most Republican leaders across the country. This letter is much more difficult because of the gratitude I will always have for you. If you do leave office history will properly record your achievements with a lasting respect."
Nixon quit the following day, and Gerald Ford became President. In October 1974, Ford sent Bush to China as the second pseudo-ambassador to that country since Mao's revolution. Apparently, there wasn't much for him to do. When the Chinese wanted something from Washington, they didn't bother with Bush. They would just call up Secretary of State Henry Kissinger. Bush was completely superfluous.
After spending a year sitting on his ass in China, Bush was tapped to head the Central Intelligence Agency in January 1976. He shuffled papers as Director of Central Intelligence for a year until Ford lost to Georgia governor Jimmy Carter. Consequently, Bush had four years of downtime.
http://www.rotten.com/library/bio/presidents/george-hw-bush/