“Fully 40 percent of the people of my State, according to the latest census, are either immigrants or the children of immigrants.”
first page, right column, ~55% of the way down:
It was in 1964 and Ted Kennedy, not Jack. My apologies.
When I said I doubted it, it was the numbers I doubt, not that you read one of them saying it, as a Catholic family they were dedicated to replacing the original Americans with Catholic immigrants from south of the border, and included non-Protestants/non-Christians globally, anything but the Protestant whites who had to be overcome.