An executive order said the United States faced a “catastrophic threat” from advanced aerial weapons. But a defense system like Israel’s may not be feasible in the country, which is more than 400 times larger.

Experts highlight logistical and strategic challenges in adapting the Iron Dome system for US homeland defense

President Donald Trump is preparing an executive order for a “next generation” defense shield to protect the US against ballistic missiles and other long-range attack.