May 20 (UPI) -- President Donald Trump announced details Tuesday about his "Golden Dome" missile defense shield that is expected to cost $175 billion and be "fully operational" by the end of his term.

"We'll have it done in about three years. Once fully constructed, the Golden Dome will be capable of intercepting missiles even if they are launched from other sides of the world and even if they are launched from space," Trump told reporters in the Oval Office, adding that Canada will be included in the project.

"Canada has called us and they want to be a part of it," Trump said. "So, we'll be talking to them. They want to have protection, also."

Trump's "Golden Dome" missile defense shield, which the president says will be made entirely in the United States, comes decades after former President Ronald Reagan's "Star Wars" vision failed to materialize. Defense Secretary Pete Hegseth said Tuesday the technology is possible now.

"The technology wasn't there. Now it is," said Hegseth. "And you're following through to say we will protect the homeland from cruise missiles, ballistic missiles, hypersonic missiles, drones, whether they're conventional or nuclear."