Prime Minister of Israel to become acting prime minister in the weeks leading to the elections. He was voted by the cabinet to be interim prime minister just after the 2006 elections, when Sharon had reached 100 days of incapacitation. He thus became Israel's third interim prime minister, only days before forming his own new government as the official Prime Minister of Israel. In 2008, amid accusations of corruption and challenges from his own party, Olmert announced that he would resign. However his successor Tzipi Livni was unable to form a coalition government. In the election in the following year, while Kadima won the
Tzipi Livni the UN Security Council was influenced by his talks with Livni and former president Shimon Peres, who said such a move could serve the political interests of those opposing the peace process. After the dissolution of the Knesset in December 2014, Labor leader Isaac Herzog and Livni announced a joint slate between Labor and Hatnuah, called the Zionist Union, to contest the 2015 elections in an effort to keep Netanyahu, leader of the Likud Party, from securing a fourth term as prime minister. They proposed to share the role of prime minister (an arrangement known in the Knesset as rotation)