UPDATE 1-Netanyahu, Gantz in unity talks; may rotate as Israel PM

Prime Minister Benjamin Netanyahu and his rival Benny Gantz launched negotiations on Monday over a proposed Israeli unity government and a key politician said the focus was on who would lead it first under a rotation deal. After failing to secure a clear victory in the second election in six months, Netanyahu, Israel's longest-serving premier, seems to reckon he can stay in power only by sharing it. Going solo, neither he nor ex-general Gantz have enough support from respective allies for a majority in the 120-member parliament.