I would love to be able to build a system that actually worked 100 percent of the time,” Sen. Mark Kelly said at POLITICO’s Security Summit, echoing doubt about President Trump’s ambitious Golden Dome initiative.

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.

U.S. President Donald Trump's Golden Dome missile defense concept revives a controversial, decades-old initiative whose ambitious construction could upend norms in outer space and reshape relations between the world's top space powers.