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.

While speaking to House Republicans in Miami, President Donald Trump says he is ordering the construction of an Iron Dome-style air defense system.

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 attacks, taking on a goal that past administrations — including his own — struggled to reach.