On August 4, 2015, three prominent Democrats watched in the Senate announced: Tim Kaine of Virginia (a member of the Foreign Relations Committee), Barbara Boxer of California (also a member of the Foreign Relations Committee) and Bill Nelson of Florida – their support for the agreement.  In a speech that day, Kaine said that the agreement was “preferable to any other alternative, including war,” and “America has respected its best traditions and shown that patient diplomacy can accomplish what isolation and hostility cannot do.”  In a similar speech on the same day, Nelson said, “I am confident that [the agreement] will prevent Iran from developing a nuclear weapon for at least the next 10 to 15 years. No other alternative available will achieve this important goal” and “If the United States were to turn away from this multinational agreement, I think we would be left alone in the world with little credibility.”  Conversely, another senator watched closely, Chuck Schumer of New York, who was to run for the Democratic Senate nominee  announced his opposition to the agreement on August 6 and wrote, “There is a strong argument that without an agreement, we are better than with one” The open letter signed by more than 100 former U.S. ambassadors and senior U.S. Department of State officials. , saying: “The Joint Comprehensive Action Plan (JCPOA) with Iran is a pioneering agreement to discourage the proliferation of nuclear weapons.”   On the other hand, Michael Mandelbaum, Christian A. Herter Professor at Johns Hopkins University, School of Advanced International Studies, wrote that the non-proliferation of nuclear weapons in the Middle East ultimately depended “not on the details of the Vienna agreement, but on the policy of deterrence known during the Cold War.” Mandelbaum added that if Obama leaves office without Iran making the bomb, “the responsibility for an effective deterrence policy will fall on his successor.”  Harvard law professor Alan Dershowitz said, “Nothing on the table will deter Iran. Sanctions are paper protests against an oil-rich nation. Diplomacy has already failed because Russia and China are playing both sides.  However, Saudi Arabia, Israel and most American Republican politicians rejected the agreement. Donald Trump has made the abandonment of the agreement a major speech of his 2016 election campaign. Like most other critics, he described the temporary nature of the JCPOA and its lack of controls on Iran`s ballistic program as serious flaws.