Richard Nixon actually said...
I call upon all the people of the United States to observe this week in heartfelt prayer, and in ceremonies and activities appropriate to voice deep concern for the prisoners and missing men, to inspire their loved ones with new courage and hope, and to hasten the day when their ordeal may end.
Context
Proclamation 4038—National Week of Concern for Americans Who Are Prisoners of War or Missing in Action
03/18/1971