Prime Minister Benjamin Netanyahu announced Monday that he had failed to form a majority government in parliament, marking a major setback for the embattled Israeli leader that plunges the country into a new period of political uncertainty. In a statement, Netanyahu said he had worked “tirelessly” to establish a unity government with his chief rival, former military chief Benny Gantz, but been repeatedly rebuffed. Facing a Wednesday deadline, Netanyahu said he was returning the “mandate” to President Reuven Rivlin, who will now ask Gantz to try to form a coalition.