Genoa, August 30 - Premier Enrico Letta on Friday said Italian law should be respected with regard to ex-premier Silvio Berlusconi's binding conviction for tax fraud. "The response is very simple: I don't think I believe there are many margins, the separation between politics and the judiciary is necessary," said Letta at a rally in Genoa for his center-left Democratic Party (PD). A Senate committee is set to vote September 9 on stripping Berlusconi of his seat in the upper house as part of an anti-corruption law that kicked in after his August 1 conviction for fraud on film rights at his Mediaset media empire. Berlusconi has appealed to the European Court of Human Rights and Italy's Constitutional Court. The three-time premier dismissed the explanation of the sentence, issued earlier Thursday, as a "collage" of previous sentences from magistrates he has always seen as left-wing. His party has threatened to pull its support from Letta's fragile executive and force snap elections if he loses his Senate seat.