Prosor will be replaced in London by National Security Advisor Uzi Arad, in a move likely aimed at restoring calm in the Prime Minister's Office.
Arad's name as been mentioned often as the person responsible for many disputes and tensions in the PM's Office.
Environmental Protection Minister Gilad Erdan decided last week to turn down Netanyahu's offer to serve as Israel's ambassador to the UN, after long deliberations. His main fear was that spending several years in New York would hurt his political aspirations.
Israel's current UN ambassador is Meron Reuven, who replaced Prof. Gabriela Shalev temporarily after Netanyahu and Lieberman failed to agree on a candidate.
Embarrassing incidents
In one of the embarrassing conflicts Arad was involved at the PM's Office, he was quoted as saying that Israel Defense Forces Chief of Staff Gabi Ashkenazi is "acting like the head of the soldiers' parents committee and not as would be expected as the army's top commander."
He was referring to Ashkenazi's support for a prisoner swap deal with Hamas which would secure kidnapped soldier Gilad Shalit's release. That same say, Arad apologized to Ashkenazi.
Several months earlier, a conflict between Arad and former National Information Directorate Nir Hefetz led to an embarrassing incident surrounding Netanyahu's secret trip to Russia in 2009.
Hefetz was forced to issue a false statement on behalf of the prime minister's military secretary, saying that Netanyahu was in a security facility in Israel although his arrival in Moscow had been leaked to the press.
The ongoing conflict between Arad and Hefetz surfaced following the incident, and the two did not speak to each other for months until a reconciliation meeting ended the feud.
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