The aim is for Golden Dome to leverage a network of hundreds of satellites circling the globe with sophisticated sensors and interceptors to knock out incoming enemy missiles after they lift off from countries like China,

"Is it a good idea for Canada? Yes, it is a good to have protections in place for Canadians," Carney said.

There are doubts from experts on how the US would deliver a comprehensive system and it is unclear how Canada would participate or how much it would pay.