The main rival to Prime Minister Benjamin Netanyahu won support from Israel's Arab coalition on Sunday to form a government, potentially undermining Netanyahu's plan to stay in power atop a proposed unity cabinet to fight the coronavirus outbreak.After a third inconclusive election in less than a year left Netanyahu still three seats short of forming a majority, the prime minister has asked his main rival, Benny Gantz, the former chief of the Israeli military, to agree to an "emergency government" to fight the global pandemic.