Some experts are worried about the cost and timeline of U.S. President Donald Trump's proposed Golden Dome missile defence system, which Canada has expressed interest in joining. They also say it could set off a space-based arms race that would escalate global tensions.

Perhaps even more surprising than the program itself is Canadian Prime Minister Mark Carney signalling support for it and potentially offering Ottawa’s backing, which could come with a multi-billion dollar investment.

2:15 Canada in talks with U.S. on ‘Golden Dome’ missile defence partnership Canada’s national security would benefit from participation in U.S. President Donald Trump’s “Golden Dome ...

Prime Minister Mark Carney's office said there are ‘active discussions’ between the two nations on security systems – both existing and future

The president also said that Canada wants in on a system the White ... “In about three years, once fully constructed, the Golden Dome will be capable of intercepting missiles even if they ...

Trump said he was inclined to let Canada take part in the project, but added “they’ll pay their fair share.” Golden Dome is expected to be one of the most expensive defence programs ever ...

President Donald Trump's plans for a $175 billion missile defense shield include significant technical challenges and political risks. Trump outlined plans for his Golden Dome in the Oval Office last week.

Pete Hegseth rejected China’s claims that the Golden Dome missile defense project would militarize space, stressing it is meant solely to protect the homeland. China condemned the project for risking a space arms race,