Three Israeli centre-left parties have failed in an initial attempt to form a united bloc that might have cut into Prime Minister Binyamin Netanyahu's lead in polls before the January 22 election.
"We didn't reach any agreement, unfortunately," centrist Hatnuah party chief Tzipi Livni told Israel Radio on Monday
after she took part in a late-night meeting with the heads of the centrist Yesh Atid party and left-leaning Labour.
Livni, a former foreign minister and peace negotiator with the Palestinians, declined to discuss details of the negotiations but said she still hoped the three parties could achieve a unity pact.
Opinion polls predict that Netanyahu's right-wing Likud party, running in the election in partnership with the nationalist Yisrael Beitenu faction led by former Foreign Minister Avigdor Lieberman, will easily win the national ballot.
Livni said a joint centre-left campaign would attract enough undecided voters, seeking an alternative to Netanyahu, to create a bloc of more than 40 seats in the 120-member parliament, topping the 37 forecast for Likud-Yisrael Beitenu.
However, polls predict the three parties running separately will amass only about 35 seats.
In the centre-left bloc, Labour is expected to lead the pack with between 16 to 18 seats, trailed by Hatnuah, with nine to 10 and Yesh Atid with nine to 11.
The broader rightwing bloc of parties is likely to take more than 65 seats.
In the election, Israelis vote for a party's list of parliament, and no one faction has ever won a majority in the legislature.
After the ballot, Israel's president chooses a party leader to try to put together a governing coalition. That is usually, but not always, the head of the party that won the most parliamentary seats.
Netanyahu has used the prospect of a centre-left union to try to win back support from traditional Likud backers who opinion polls show intend to vote for Bayit Yehudi, a far-right party led by Naftali Bennett, a former settler leader who wants to annex parts of the occupied West Bank.
"Against the left-wing bloc, you need a large Likud-Yisrael Beitenu," Netanyahu said repeatedly at a campaign event late on Sunday - a party held for hundreds of young Likud supporters at a Tel Aviv night club.
Livni has proposed that Hatnuah, Yesh Atid and Labour, should they form a bloc but lose the election, consider joining a Netanyahu-led government as an alternative to smaller religious parties and Bayit Yehudi, which has surged in polls.
However, Labour party head Shelly Yachimovich, in a separate Israel Radio interview, ruled that out.
"Whoever thinks that you can change Netanyahu from inside, meaning by sitting next to the driver's seat and pressing the brakes ... is misleading the public. As long as Netanyahu is prime minister, nothing will change," she said.