Documented Facts
The Dimona nuclear reactor in the Negev Desert was the central conflict of the Kennedy-Israel relationship. Kennedy was alarmed by CIA intelligence indicating Israel was building nuclear weapons capability, and he made repeated, escalating demands for regular American inspections of the facility.
In a May 18, 1963 letter to Prime Minister Ben-Gurion — now declassified and held at the JFK Library — Kennedy wrote that the U.S. "commitment and support" to Israel could be "seriously jeopardized" if Israel did not permit semi-annual American inspections of Dimona with "access to all areas of the Dimona site."
Kennedy's letter was extraordinary in its directness: he told Ben-Gurion that U.S. support for Israel's security was contingent on nuclear transparency. This was not a diplomatic suggestion — it was a conditional threat.
Ben-Gurion's response was to resign as Prime Minister on June 16, 1963 — just weeks after receiving Kennedy's letter. His stated reason was "personal reasons." His successor, Levi Eshkol, was left to manage the Dimona negotiations.
Kennedy sent an equally firm letter to Eshkol on July 5, 1963, reiterating the demand for inspections "twice a year." Kennedy wrote: "I am sure you will agree that these visits should be as open as possible and that your purpose is to leave no room for doubts or misunderstandings."
Kennedy was assassinated on November 22, 1963. The Dimona reactor went critical — became operational — on December 26, 1963, just 34 days later. Under LBJ, the inspection demands were quietly dropped.
Key Quote — Primary Source
"I am sure you will agree that these visits should be as open as possible and that your purpose is to leave no room for doubts or misunderstandings... the commitment and support of the United States to Israel could be seriously jeopardized."
— President John F. Kennedy, letter to Prime Minister Levi Eshkol, July 5, 1963 (declassified, JFK Library)
Why This Matters
Kennedy's assassination removed the only U.S. president who had made nuclear non-proliferation a condition of U.S.-Israel relations. The Dimona reactor went operational 34 days after his death. Israel is now estimated to possess 80–400 nuclear warheads and has never signed the Nuclear Non-Proliferation Treaty.
Primary Sources
NSArchive: 'Battle of the Letters, 1963' (May 2, 2019) — full declassified correspondence
JFK Library: Israel Nuclear Energy Program folder, 1963
Wilson Center: 'Kennedy, Dimona and the Nuclear Proliferation Problem, 1961–1962'
Foreign Policy: 'How the Israelis Hoodwinked JFK on Going Nuclear' (April 26, 2016)
NSArchive: 'Israel, the United States, and the Dimona Inspections, 1964–65' (November 10, 2020)