However, towards the end of his term and largely as a result of the deep divisions within Likud over Israel's unilateral disengagement plan, Sharon broke away from his party to form Kadima, managing to maintain his position as prime minister and also becoming the first prime minister not to be a member of either Labour or Likud (or their predecessors). However, he suffered a stroke in January 2006, in the midst of election season, leading Ehud Olmert 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.