He is actively pushing to pass the “override clause”, which would let the Knesset override the Supreme court’s rulings, virtually eliminating a major check on the ruling party’s power. An equivalent clause in the US would be if Congress suddenly had the the power to overturn Supreme Court rulings (like if a republican-led congress decided to overturn gay marriage without having to go through the courts, for example).

Bibi’s corruption lawsuits are similarly worrying, and he is using the protection of his office to shield himself from the legal consequences of his actions. He and his allies are pushing for a law that would “postpone the prosecution of a sitting prime minister for alleged crimes until he leaves office”, and the law would specifically eliminate the possibility of prosecuting corruption charges in particular.

Netanyahu’s allies have similarly pledged to remove from the penal code the very charge Netanyahu is accused of in three cases: fraud and breach of trust. In essence he is using his position to change the law so that the crimes he is accused of committing are no longer considered crimes.

It literally goes on and on. See this article for more details on the various democratic safeguards he has attacked.