Jerusalem (CNN) Prime Minister Benjamin Netanyahu's election victory makes him odds on to secure a historic fifth term in office. Assuming he can tie up coalition negotiations, he should become Israel's longest serving leader at some point over the summer. But the term could also be Netanyahu's shortest, as corruption investigations cast a growing shadow over the right wing of Israeli politics.

If he is indicted on corruption charges -- after a hearing expected at some point in the next few months -- his days could be numbered. While his coalition partners are willing to support him now because of his command of Israel's right-wing constituency, that support could be imperilled if charges of bribery or breach of trust are handed down by Israel's Attorney General, Avichai Mandelblit.

Despite railing against the investigations as a media-fueled witch hunt, Netanyahu is well aware of the risk they pose to his reign. In his previous coalition, some of the smaller right-wing parties intimated that an indictment would mark the end of Netanyahu's time in office.

Anshel Pfeffer, author of the book "Bibi: The Turbulent Life and Times of Benjamin Netanyahu," predicts that Netanyahu will use his new government to try to pass immunity laws that would protect him.

But even if he tries, it's unclear whether Netanyahu would have the votes to succeed. "Assuming the immunity attempt fails, which I think it will, and assuming Mandelblit goes through with [indictments], which I think he will as well, there's the saga of, 'Will Netanyahu go to trial as a serving Prime Minister?'" says Pfeffer. "He plans to."

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