Rodger Davies, the director of the State Department's Office of Near Eastern Affairs, concluded in March 1965 that Israel was developing nuclear weapons. He reported that Israel's target date for achieving nuclear capability was 1968–1969. On May 1, 1968, Undersecretary of State Nicholas Katzenbach told President Johnson that Dimona was producing enough plutonium to produce two bombs a year. The State Department argued that if Israel wanted arms, it should accept international supervision of its nuclear program. Dimona was never placed under IAEA safeguards. Attempts to write Israeli adherence to the Nuclear Non-Proliferation Treaty (NPT) into contracts for the supply of U.S. weapons continued throughout 1968.