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
Faisal I of Iraq following year. On 4 January 1919, Emir Faisal and Dr. Chaim Weizmann, President of the Zionist Organization, signed the Faisal–Weizmann Agreement for Arab-Jewish Cooperation, in which Faisal conditionally accepted the Balfour Declaration, a personal declaration by British politician, Lord Balfour, promising British support to the development of a Jewish homeland in Palestine. Once Arab states were granted autonomy from the European powers, years after the Faisal-Weizmann Agreement, and these new Arab nations were recognized by the Europeans and the U.N., Weizmann argued that since the fulfillment was kept eventually, the agreement for a Jewish homeland in Palestine still held. In