Kind of shows you how useless the position is though, the best that could be done was to give a brief warning...
Discussion
If you read "Confessions of a Nuclear War Planner", among other books, Eisenhower did manage to slow the progression of the disease while in office, thus allowing an economic boom, infrastructure development, and real wage increases. And he avoided being corralled into global nuclear war more than once.
But yes, his warning was his only lasting achievement.