U.S. President Donald Trump said the U.S. has chosen a design for the futuristic "Golden Dome" missile defense system, adding that it will operate at the end of his tenure.

Days after returning to the White House in January, Trump announced his intentions for the system, aiming to deal with the "next generation" air threats to the United States, including ballistic and cruise missiles.

The initial $25 billion (£18.7 billion) has been designated as the new budget bill - although the government estimates the ultimate cost will be much higher than it has cost for decades.

Officials warn that existing systems are not in sync with increasingly complex weapons that potential opponents have.

President Trump also announced that Space Force General Michael Guetlein will oversee the project. Gen Guetlein is currently the deputy space operation director for the Space Force.

Seven days after the second administration, Trump ordered the Department of Defense to submit a plan to prevent and defend air attacks, and the White House said the "most disastrous threat" facing the United States remains the one facing the United States.

Speaking at the Oval Office on Tuesday, Trump said the system will include "next generation" technologies that are spread across land, oceans and space, including sensors and interceptors in space. He added that Canada requires being part of the system.

During a visit to Washington earlier this year, then-Canadian Defense Secretary Bill Blair admitted that Canada was interested in participating in the Dome Project, deemed it “meaningful” and in the country’s “national interest.”

He added that “Canada must know what’s going on in the region” and is aware of the incoming threats, including the Arctic.

Trump added that the system would "even be able to intercept missiles launched from the other end of the world or from space."

Part of the system is inspired by Israel’s Iron Dome, which has been intercepting rockets and missiles since 2011.

However, the Golden Dome will be large in large numbers and aim to deal with a wider range of threats, including treble weapons (also known as FOBs) that can move faster than sound and fractional orbital bombing systems (also known as FOBs).

"Everyone will be eliminated," Trump said. "The success rate is close to 100%.

U.S. officials have previously said the purpose of the Golden Dome is to allow the United States to stop missiles at all stages of deployment, including before launch and when they are still airing.

Many aspects of the system will fall under a centralized command, U.S. defense officials said.

Trump said Tuesday that the initial investment of the program was $25 billion, with a total cost of $175 billion over time. The initial $25 billion was determined in one of his large tax bills and has not been approved.

However, the Congressional Budget Office estimates that the government can eventually spend more time on the space-based part of the system, up to $5.42 billion.

Pentagon officials have long struggled that the existing systems have not been in sync with new missile technologies designed by Russia and China.

"There is really no current system," Trump said in the Oval Office on Tuesday. "We have certain areas of missiles and certain missile defense, but there is no system ... there has never been such a thing."

A recent briefing document released by the defense intelligence agency states that the missile threat “will expand scale and complexity” and that China and Russia actively design systems to “develop gaps in U.S. defense.”