Benny Gantz, an Israeli opposition leader in the country’s three-man war Cabinet, said Saturday that if Prime Minister Benjamin Netanyahu doesn’t offer a new plan to bring back hostages and end Hamas rule in Gaza by June 8, he’ll leave the government.

Gantz’s departure would greatly increase already mounting pressure on Netanyahu seven months after a Hamas attack devastated Israel and led it to wage an unforgiving war in Gaza. It wouldn’t on its own collapse the ruling coalition, which has 64 seats out a 120-seat parliament.

Netanyahu instantly rejected the demand.