Prime Minister () from 4 January to 14 April, according to Basic Law: The Government: "Should the Prime Minister be temporarily unable to discharge his duties, his place will be filled by the Acting Prime Minister. After the passage of 100 days upon which the Prime Minister does not resume his duties, the Prime Minister will be deemed permanently unable to exercise his office." Basic Law: the Government 2001, section 16b In Sharon's case, this occurred on 14 April 2006, upon which Olmert became Interim Prime Minister for the remainder of the 30th government, finally becoming full Prime Minister on the formation of the 31st government. Olmert officially resigned on 21 September 2008. With this, his cabinet became an interim government, and he was the "Interim" Prime Minister until the establishment of a new governing coalition (he was officially the Prime Minister, however, the government under him was an interim government, in this case). Under the coalition agreement establishing the thirty-sixth government of Israel, Naftali Bennett's tenure as Prime Minister concluded at the end of 30 June 2022 and Yair Lapid took office at the beginning of 1 July 2022. The following parties were members of a government during only part of its term: 9th: Progress and Development and Cooperation and Brotherhood, two new parties, were members of the 9th government, which was otherwise identical in composition to the 7th and 8th governments. 13th: Gahal and Rafi joined 5 June 1967. Rafi merged into Labor (a member of the Alignment) 23 January 1968. 15th: Gahal stood down 6 August 1970. 17th: National Religious Party joined 30 October 1970; Ratz stood down 6 November 1970. 18th: Democratic Movement for Change joined October 1977. 19th: Tehiya joined 26 August 1981; the Movement for the Renewal of Social Zionism was formed 6 June 1983 following the break-up of Telem. 22nd: Morasha was not included in the 22nd government, which was otherwise identical in composition to the 21st government. 25th: Shas stood down 14 September 1993; Yiud joined 9 January 1995. 28th: United Torah Judaism stood down September 1999. 29th: Shas stood down 23 May 2002, returned 3 June; Labor-Meimad stood down 2 November 2002. 30th: National Religious Party joined 3 March 2003, stood down 11 November 2004; National Union stood down 6 June 2004; Shinui stood down 4 December 2004; Labor-Meimad joined 10 January 2005; Agudat Yisrael joined 30 March 2005; Kadima broke