Kadima acting chairman for the March elections. Kadima won 29 seats, and was asked to form a government by president Moshe Katsav. Olmert formed a coalition with Labor, Shas and Gil, the government being sworn in on 4 May. Yisrael Beiteinu joined the coalition in October 2006, but left again in January 2008 in protest at negotiations with the Palestinian Authority. Olmert resigned as party leader in 2008, resulting in a leadership election, held on 17 September. The vote was won by Tzipi Livni, who beat Shaul Mofaz, Meir Sheetrit and Avi Dichter. Following her victory, Livni failed to form a
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)