Israeli Prime Minister Benjamin Netanyahu is expected to receive formal backing to remain premier for a fifth term Wednesday, but tough negotiations to form a coalition government await following last week's elections.
Rivlin's office said Tuesday he planned to meet with his choice for premier at 7:00 pm (1600 GMT) Wednesday and both would speak publicly about an hour later.
Together with allied right-wing and religious parties, Netanyahu is best placed to form a coalition with results showing they would control 65 seats in the 120-seat parliament.
Rivlin wrapped up consultations with political parties on Tuesday and a key politician threw his backing behind Netanyahu.
His party, Yisrael Beitenu, also told Rivlin on Tuesday that it would back Netanyahu and its five seats will be crucial for the prime minister as he forms his next coalition.
But Lieberman also said he would condition his joining the coalition on the adoption of a law aimed at having ultra-Orthodox Jews serve in the military like their secular counterparts.
He has insisted that the version of the law he proposed when he was defence minister be adopted in full and says he will even remain in the opposition or be prepared to go to new elections if he does not receive assurances on the subject.
Ultra-Orthodox Jews studying in religious seminaries are currently exempt from mandatory military service, a practice many Israelis view as unfair.
But attempts to change the law have met with strong opposition from ultra-Orthodox political parties, which according to results so far would control 15 seats in the next governing coalition.
Ultra-Orthodox political leaders have warned they are not prepared to compromise over Lieberman's demands.
Ultra-Orthodox Jews make up some 10 per cent of Israel's nearly nine million population.
Complications in passing a law on the subject contributed to the holding of early elections last week.
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