Crucial US missile stockpiles 'extremely low,' official says

The U.S. war in Iran has depleted stocks of key air defense weapons, including ballistic missile interceptors -- a potential constraint for President Donald Trump as he weighs the prospect of renewing the conflict. A Center for Strategic and International Study analysis of air defense systems found that Patriot stockpiles have been depleted by two-thirds and the THAAD missile inventory, which it estimated was 452 before the start of the war, has been reduced by half. A U.S. official, who would not discuss numerical estimates, told ABC News that both stockpiles "are extremely low." Additionally, the official said that of particular concern was the low inventories of long-range offensive missiles like the ATACM and PRSM. Trump on Thursday acknowledged that "we need more all the time" but "we have certain types of munitions that are very powerful [of which] we have unlimited, virtually unlimited supply." "We have others where it's a little bit tighter, and we're getting them in on a daily basis," the president said. It was unclear which munitions Trump was referring to. Each missile costs about $4 million and can take as long as two years to make.