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.

The system is intended to protect the United States from ballistic, cruise and hypersonic missiles, and missiles launched from space.

U.S. President Donald Trump's massive tax and spending bill could help bring stability but it is not conducive to deficit reduction.