Mr Netanyahu and his family have been the subject of several allegations of corruption during his time in office.

In June this year, it was reported that Israel Police Chief Roni Alsheich gave his approval on the secret investigation by special police unit Lahav 433, but that he had demanded full cooperation on secrecy and that no details be leaked to the media.

Mandelblit also reportedly instructed employees in the state prosecutor’s office to look into allegations that Netanyahu accepted 1 million euros (about $1.1 million) from accused French fraudster Arnaud Mimran in 2009.

The Times also reported that in May, Israel’s state comptroller issued a critical report on Netanyahu’s overseas trips, some of which were taken with his wife and children, from the period of 2003 to 2005, when he served as Israel’s finance minister.

In an apparently unrelated case earlier this month, there were calls for the prime minister to be investigated for his role in a Defense Ministry deal to purchase submarines from a German company partly owned by the Iranian government – which Israel sees as a major enemy.

The affair sparked public controversy in the country last month, after accusations surfaced that the prime minister may have been swayed in the decision by links between his personal lawyer David Shimron and the submarines’ builder, ThyssenKrupp. Both Mr Netanyahu and Mr Shimron denied any wrongdoing.

Mr Netanyahu said: “Increasing the security and strength of the state of Israel is the only consideration that guided me in acquiring the submarines.”

On Sunday, police swooped on the Defense Ministry to gather information relating to a ship-building contract with Germany, as part of a probe into how negotiations for multi-billion shekel naval deals were handled.

The question that must be asked is, “is this latest investigation legitimate or is it a mere setup to frame Prime Minister Netanyahu?”