1949 amendment to the British Mandate’s 1928 Nationality Law in 1949 effectively imposed Jordanian citizenship on 420,000 indigenous Palestinians and 280,000 refugees in the West Bank and 70,000 refugees in the East Bank before formal annexation on 24 April 1950. Then in 1954, Jordan’s Nationality Law clarified the conditions under which Arabs with previous "Palestinian nationality" could obtain Jordanian citizenship. Unlike any other Arab country to which they fled after the 1948 Arab–Israeli War, Palestinian refugees in the West Bank (and on the East Bank) were given Jordanian citizenship on the same basis as existing residents. Elihu Lauterpacht described it as a move that "entirely lacked legal justification." The annexation formed part of Jordan's "Greater Syria Plan" expansionist policy, and in response, Saudi Arabia, Lebanon and Syria joined Egypt in demanding Jordan's expulsion from the Arab League. A motion to expel Jordan from the League was prevented by the dissenting votes of Yemen and Iraq. On 12 June 1950, the Arab League declared the annexation was a temporary, practical measure and that Jordan was holding the territory as a "trustee" pending a future settlement. On 27 July 1953, King Hussein of Jordan announced that East Jerusalem was "the alternative capital of the Hashemite Kingdom" and would form an "integral and inseparable part" of Jordan. In an address to parliament in Jerusalem in 1960, Hussein called the city the "second capital of the Hashemite Kingdom of Jordan". Only the United Kingdom formally recognized the annexation of the West Bank, de facto in the case of East Jerusalem. In 1950, the British extended formal recognition to the union between the Hashemite Kingdom and that part of Palestine under Jordanian control - with the exception of Jerusalem. The British government stated that it regarded the provisions of the Anglo-Jordan Treaty of Alliance of 1948 as applicable to all the territory included in the union. The United States Department of State also recognized this extension of Jordanian sovereignty. Pakistan is claimed to have recognized Jordan's annexation too, but this is disputed. Despite Arab League opposition, the inhabitants of the West Bank became citizens of Jordan. Tensions continued between Jordan and Israel through the early 1950s, with Palestinian guerrillas and Israeli commandos crossing the Green Line. Abdullah I of Jordan, who had become Emir of Transjordan in 1921 and King in 1923, was assassinated in July 1951 during a visit to the Jami Al-Aqsa on