"The rate of voting is high in the strongholds of the left and low in the strongholds of the right, it is a disaster", Netanyahu said.
The prime minister tweeted pictures of the voting process in two polling stations, one semi-empty and the other crowded.
The prime minister called on his supporters "to go and vote, otherwise, we will get the left-wing government with the Arab parties!"
According to the i24NEWS news agency, Netanyahu hastily summoned members of the Likud centre-right party and Knesset for an emergency meeting at his residence in Jerusalem, in light of the turnout news.