Earlier in the day, Netanyahu asked the speaker of the Israeli Parliament to grant him parliamentary immunity.
"Netanyahu knows that he is guilty. When one knows that one is innocent, he is unafraid to present himself before the court", Gantz said in a speech broadcast via the internet.
Another prominent Israeli politician and leader of the party Yisrael Beytenu, Avigdor Lieberman, wrote on Twitter that his party would vote against granting immunity to Netanyahu.
Netanyahu has been the subject of multiple corruption investigations, including over claims he received expensive gifts from various businessmen, advanced a law that would benefit one of Israel's major newspapers, and supported looser regulation of telecommunication company Bezeq in return for positive coverage. In November, Attorney General Avichai Mandelblit indicted Netanyahu on bribery charges.