A mass walkout of delegates before Israeli Prime Minister Benjamin Netanyahu’s address to the United Nations General Assembly prompted a fiery response from the Israeli leader.As Netanyahu took the stage, dozens of delegates from across the globe could be seen streaming out of the chamber in New York City. Chants of protest could also be heard in the hall as the U.N. president called the assembly to order.After taking the stage, Netanyahu said, "Before I begin, just a quick announcement, if there are any other moral cowards who haven't yet left this hall, please do so now," as cheers erupted f...