The ambitious plan for a new U.S. missile-defense shield needs to navigate technology hurdles and budget questions.

President Donald Trump picked a design for his Golden Dome missile defense system and named a leader of the ambitious $175 billion defense program. The program, first ordered by Trump in January, aims to create a network of satellites, perhaps numbering in the hundreds, to detect, track and potentially intercept incoming missiles.

President Donald Trump has announced the concept he wants for his future Golden Dome missile defense program — a multilayered system that for the first time will put U.S. weapons in space.