Likud Chairman Binyamin Netanyahu was questioned by the National Fraud Squad in Bat Yam on Tuesday.
Netanyahu was called to testify following a complaint submitted to police that Yaakov Katz, who was then chairman of the Education Ministry's pedagogy department conducted surveys for Netanyahu using the ministry's funds.
Katz was arrested half year ago on suspicion that, in addition to his job in the Education Ministry, he ran a private research institution using the Education Ministry's money.
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