In 1958, he became chairman of the U.S. Atomic Energy Commission. According to journalist Seymour Hersh, in December 1960, while still Atomic Energy Commission chairman, McCone revealed CIA information about Israel's Dimona nuclear weapons plant to The New York Times. Hersh writes that President John F. Kennedy was "fixated" on the Israeli nuclear weapons program and one of the reasons that contributed to McCone's appointment as CIA director was his willingness to deal with this and other nuclear weapons issues – and despite the fact that McCone was a conservative Republican.Seymour Hersh, The Samson Option: Israel's Nuclear Arsenal and American Foreign Policy, Random House, 1991, 72–73, 105, 120.
