WASHINGTON — US Defense Secretary Pete Hegseth said Saturday that a massive US-Israeli attack on Iran — which Washington says killed the country’s supreme leader — showed that those who harm Americans must pay a price. “If you kill or threaten Americans anywhere in the world — as Iran has — then we will hunt you down, and we will kill you,” Hegseth wrote on X. READ: Iran’s supreme leader Khamenei confirmed dead – Trump... Keep on reading: Hegseth says Iran attack sends message to enemies: 'We will kill you'