10/23/1960
https://www.presidency.ucsb.edu...
"We will continue unrelenting in our efforts to attain these goals."
"I regret to find that this letter departs from accepted international practice in a number of respects."
"I still entertain the hope that direct communications between us may serve the cause of peace."
"Your statement with respect to the Secretary of State is not only unwarranted, but is personally offensive to me."