Tzipi Livni and spoke to Livni, reassuring her that she was "most welcome in Britain any time." Livni's office later stated that Brown promised to seek legislative changes to ensure no Israeli official would risk arrest while on British soil. Yehuda Blum, Israel's former ambassador to the United Nations and a professor of law at Hebrew University of Jerusalem, commented: "The abuse and misuse of this concept of universal jurisdiction should be discontinued." Blum said the law was intended for use in cases with no clear jurisdiction, such as piracy in international waters, and should not be expanded for political aims. Israeli
Tzipi Livni Livni and Shaul Mofaz emerged as the main rivals for the leadership. Livni won the Kadima leadership election by a margin of just 431 votes (1%). Palestinian peace negotiators were reportedly pleased with the result. As the new leader of the ruling party, Livni became prime-minister designate. Upon declaring victory, she stated "the national responsibility (bestowed) by the public brings me to approach this job with great reverence." On 21 September 2008, Olmert formally resigned in a letter submitted to president Shimon Peres, and the following day Peres formally asked Livni to form a new government. Livni faced tough negotiations