Haim Saban (Democratic donor) and Paul Singer (Republican donor) convened a private dinner featuring U.S. Ambassador to the UN Nikki Haley, Jared Kushner, and Jason Greenblatt. The kosher-catered dinner, held in a private room at New York’s Pierre Hotel, was for senior administration officials to discuss their emerging Israeli-Palestinian peace plan with powerful Jewish business and communal leaders, the latest of several private briefings for Jewish power brokers…