We discovered sometime later... when the correspondence was made public by Hanoi... that four days before our letter could arrive in Hanoi... a letter arrived there, sent over PresidentJohnson's signature... which was a very hard line letter indeed... which restated all the previous conditions regarding cessation of the bombing... and even added some new ones... and which was, in our judgment... intended to do what it did do... which was to break off any possibility of negotiation at that time.
