Chaim Weizmann institute was a global success attracting scientists from all over the Diaspora. In 1949 there were 20 researchers, twenty years later there were 400 and 500 students. The Honourable Chaim Weizmann met with United States President Harry Truman and worked to obtain the support of the United States, they discussed emigration, for the establishment of the State of Israel. The President lived at Rehovot, where he regularly received the Prime Minister David Ben-Gurion into his garden. He was denied any actualisation of the political role he had hoped for by the Left. He had to be consoled with the Weizmann
Chaim Weizmann massive decline from the high of 200,000 reached during the peak Brandeis years. In summer 1930, these two factions and visions of Zionism, would come to a compromise largely on Brandeis's terms, with a restructured leadership for the ZOA. An American view is Weizmann persuaded the British cabinet to support Zionism by presenting the benefits of having a presence in Palestine in preference to the French. Imperial interests on the Suez Canal as well as sympathy after the Holocaust were important factors for British support. Jewish immigration was purposely limited by the British administration. Weizmann agreed with the policy but