If a primary candidate fails to form a coalition, the Israeli president can assign the task to a second candidate for 28 days without an extension option

From the articleIsraeli president picks Gadi Eisenkot, Netanyahu rival, to try to form governmentAlso in Yashar's Eisenkot to receive mandate to form new government, president announces, Israeli president taps ex-general Eisenkot, opponent of Netanyahu, to form government, Israel President taps opposition leader Eisenkot to form government, challenging Netanyahu
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