Such defense systems are extremely costly” with “their effectiveness often being questionable,” one expert said.

For more than 60 years, the military has launched reconnaissance, communications, and missile warning satellites into orbit. Trump's executive order calls for the Pentagon to come up with a design architecture, requirements, and an implementation plan for the next-generation missile defense shield within 60 days.

President Trump on Monday night signed an executive order to create a next-generation missile defense shield, which the White House referred to as the “Iron Dome for America” after Israel’s