Likud members are voting in the primary elections for the party's leadership today.
Israeli Prime Minister Benjamin Netanyahu is expected to win the vote by a majority, although he faces a challenge from Moshe Feiglin, head of the ultra-right wing Likud faction, "Jewish Leadership".
Mr Feiglin has already challenged Mr Netanyahu unsuccessfully in other Likud primaries, but he won just 23.4 per cent of the vote in 2007.
Around 130,000 Israelis are eligible to vote.
