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Israel is facing a third general election in a year after politicians failed to agree on the compositon of a new agreement before the deadline of midnight on Wednesday
It was their first round of direct talks since president Reuven Rivlin on Wednesday tasked Gantz with trying to form a government.
The prime minister has given up trying to form a governing coalition.
Blue and White and Likud are currently tied on seats after the country's second election in a year.