In the second case, he is suspected of offering preferential treatment to a newspaper publisher in exchange for favourable coverage.
Netanyahu has angrily rejected the accusations and denounced what he describes as an overzealous police investigation.
In a televised address on Wednesday, he said he had faced 15 investigations over the years, all of which, he claimed, amounted to nothing.
He similarly predicted the latest uproar would pass.
For the time being, Netanyahu's job remains secure, with his coalition lining up behind him as opponents urge him to step aside. His attorney general, Avihai Mandelblit, will now review the evidence and make the final decision on whether to press charges - a process that is expected to take months.
That means Netanyahu faces a difficult period ahead as his every move will be clouded by the looming investigation.
Here is a look at some of the scandals that have plagued Netanyahu, his family and his confidants over the years.
Influence peddling
During his first term in office in the 1990s, Netanyahu was suspected of engineering the short-lived appointment of a crony as attorney general in exchange for political support from the Shas party. Prosecutors called Netanyahu's conduct "puzzling", but stopped short of filing charges.
Gifts affair
During that same stint as Prime Minister, Netanyahu and his wife, Sara, were suspected of taking gifts he received from world leaders - items considered state property. They also were suspected of accepting favours from a contractor. Both cases were closed without charges.
Travel expenses
Netanyahu was suspected of double billing travel expenses and using state funds to cover travel for his family in the 2000s, while he was Finance Minister and opposition leader. After a lengthy investigation, the attorney general dismissed the case.
Household help
Sara Netanyahu has faced repeated allegations of mistreating household help. During Netanyahu's first term in office, the family's nanny said she was fired by Netanyahu's wife for burning a pot of vegetable soup. The young woman said she was thrown out of the family's home without her clothes or passport, and later was ordered to pick up her belongings dumped outside the front gate. Netanyahu's office said the woman was fired because she was prone to violent outbursts.
More recently, a Jerusalem labour court awarded US$30,000 in damages to a former employee of the first lady who claimed he faced yelling and unreasonable demands. Last month, a recording emerged of Sara Netanyahu screaming at an aide as she complained that a gossip column about her did not mention her educational credentials.
Hey, big spender
In 2016, an official expense report found that Netanyahu spent more than US$600,000 of public funds on a six-day trip to New York, including US$1600 on a personal hairdresser. Three years earlier, he was chided for spending US$127,000 in public funds for a special sleeping cabin on a flight to London. Netanyahu said he was unaware of the cost and halted the practice. He also halted purchases at his favourite Jerusalem icecream parlour that year after a newspaper reported his office ran up a US$2700 bill, mostly for vanilla and pistachio.
Questionable spending
Israel's attorney general announced last year that he is considering charging Sara Netanyahu with graft, fraud and breach of trust for alleged overspending of more than US$100,000 in public funds on private meals at the Prime Minister's official residence. At the same time, the attorney general dismissed allegations that the Netanyahus used government money to buy furniture for their private beach house and used state funds to pay for medical care for Sara Netanyahu's late father.
Netanyahu's son
Last month a recording surfaced of Netanyahu's eldest son, Yair, joyriding with his wealthy buddies to Tel Aviv strip clubs in a drunken night out in a taxpayer-funded government vehicle. The 26-year-old Netanyahu has drawn criticism over the years for living a life of privilege at taxpayers' expense, hobnobbing with ultra-rich donors and making crude social media posts, all while never holding down a job.
Cabinet minister
Defence Minister Avigdor Lieberman, a Netanyahu confidant, was suspected in a long-running corruption case of illicitly receiving money and laundering it through shell companies in eastern Europe. In 2012, Israel's attorney general dismissed the most serious charges, saying the case would be virtually impossible to prove.
A report at the time said he noted that key witnesses lived outside the country, that Lieberman's lawyer had invoked the right to remain silent, and that two key witnesses had died while a third had disappeared.
Lieberman was indicted on lesser graft charges. That case forced him to step down as Foreign Minister, but he was ultimately cleared and returned to the post a year later.
Netanyahu's whip
David Bitan, one of Netanyahu's closest allies, resigned as coalition whip in December due to suspicions that he accepted bribes as a municipal politician. Bitan has invoked his right to remain silent during repeated police interrogations.
- AP
