The heads of Israel’s two leading parties, Prime Minister Binyamin Netanyahu of Likud and Benny Gantz of Kachol Lavan, met Monday night for the first time since Israel’s Sept. 17 election under the auspices of President Reuven Rivlin. He urged them to negotiate forming a national unity government to overcome the stalemate generated by the election whereby neither party had enough support to form a viable. coalition government. After the first part of the meeting, Rivlin left the two leaders alone. When it ended, the president said: “This evening we took a significant step and our first task now is to build a direct line of dialogue in mutual trust.” Netanyahu and Gantz arranged to meet again on Wednesday.