Richard Nixon actually said...
In tribute to the achievement of Columbus, the Congress of the United States, by joint resolution approved April 30, 1934 (48 Stat. 657), as modified by the act of June 28, 1968 (82 Stat. 250), requested the President to proclaim the second Monday in October of each year as Columbus Day.
Context
Proclamation 4231—Columbus Day, 1973
08/13/1973