PM Mark Carney's office says there are "active discussions" on the Golden Dome, but it's too early to say how Canada would join or pay in.

Donald Trump says Canada has asked to join the missile-defence program his administration is building, adding a new chapter to a long-running cross-border saga.

President Donald Trump has laid out new details of his ambitious plan to build a “Golden Dome” missile system to protect the United States from foreign attacks, saying it will be complete before he leaves office.