Richard Nixon actually said...
Normally invitations go out, as you know, about 3 to 4 weeks in advance, and because we want to be sure that for our distinguished guests we have all of the places filled, we usually send 20 more invitations than the 110 that this room will seat, and always the cancellations make it possible not only for us to have not just the 110 that the room will seat, but we can add a few more at the last minute.
Context
Toasts of the President and Prime Minister Golda Meir of Israel
02/28/1973