The Zionist Union head was not aware of the illicit donation, which was not reported by the party, the police found. The contribution helped fund a smear campaign against Herzog’s opponent in the race, Labor MK Shelly Yachimovich.

While the donation is still under investigation, the National Fraud Unit will not suggest an indictment against Herzog, according to a statement by police spokesperson.

Attorney General Avichai Mandelblit, who requested the investigation, and Tel Aviv’s prosecutor’s office are expected to make a formal declaration of the decision, according to The Times of Israel.

The investigation was announced in March, but started months earlier, the Jerusalem Post reported.

In April, Herzog said that he asked to come in and give his statement to the police “in order to put the matter behind me as soon as possible.”

The Zionist Union is made up of Labor and the Hatnua party led by Tzipi Livni, a former foreign minister.