The united Likud-Yisrael Beytenu list is set to face its first challenge this week, as the move will be taken to the former party's central committee for a vote on Monday.
The agreement has yet to be put down on paper or signed by Prime Minister Binyamin Netanyahu or Foreign Minister Avigdor Liberman, though the latter said they have been discussing it for almost a year and made a final decision two months ago.
Netanyahu is expected to face strong opposition from many committee members, with Government Services Minister Michael Eitan, who spoke out against running with Yisrael Beytenu, calling for the vote to be conducted by secret ballot, saying that is the only way for it to be democratic.
Still, party sources estimated that opinions are evenly split on the unity deal, and Netanyahu would not have trouble passing the agreement in the committee.
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