Lyndon Johnson actually said...
Now, Therefore, I, Lyndon B. Johnson, President of the United States of America, do hereby proclaim this day, May 3, 1966, as Poland's National and Christian Millennium Day on which we spiritually unite ourselves with the people of Poland and those gathered today at Jasna Cora and wherever they might be observing this historical event.
Context
Proclamation 3720—Commemoration of Poland's National and Christian Millennium
05/02/1966