President Trump signed an executive order to build an "Iron Dome for America," modeled on Israel’s missile defense system.

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.

The statement came days after Trump signed an order that ”mandated a process to develop an ‘American Iron Dome,’” a next-generation U.S. missile defence shield against ballistic, hypersonic, cruise missile and other forms of aerial attack.