Lyndon Johnson actually said...
I also urge each and every one to meditate that day on the meaning that our flag held for our forefathers and what it means to us today, and to that end to rededicate ourselves to the principles which our flag symbolizes-equality, justice, and liberty for all peoples whatever their race, color, or creed principles which have made ours a great and respected nation.
Context
Proclamation 3593—Flag Day, 1964
05/27/1964