Donald Trump wants to cancel the new Air Force One

President-elect Donald Trump has called for the cancellation of the new Air Force One in a tweet, citing the fact that the program would cost $4 billion.

This becomes the latest controversy over the aircraft used to transport the President of the United States, or "POTUS."

According to a report by Fox Business Network, Trump initially tweeted his intent to cancel the contract, saying, "Boeing is building a brand new 747 Air Force One for future presidents, but costs are out of control, more than $4 billion. Cancel order!" Trump later backed up the tweet in comments outside Trump Tower.

Boeing is building a brand new 747 Air Force One for future presidents, but costs are out of control, more than $4 billion. Cancel order!

— Donald J. Trump (@realDonaldTrump) December 6, 2016

The current Air Force One, the VC-25A, is based on the Boeing 747-200 airliner. The VC-25 entered service in 1990 under President George H. W. Bush.

Two VC-25As are in service, with the tail numbers 28000 and 29000. The planes are equipped to serve as airborne command posts, and have a range of 6,800 nautical miles.

The planes can be refueled in flight and also have the AN/ALQ-204 HAVE CHARCOAL infra-red countermeasures system. The previous Air Force One was the VC-137C, based on the Boeing 707.

The new Air Force One is based on the 747-8. While the current Air Force One has received upgrades throughout its life, the 747-200 has largely been retired from commercial aviation fleets.

This has caused the logistical support to become more expensive. The 747-8 also features a longer range (7,700 nautical miles) and will be easier to support.

Trump spokesman Jason Miller told reporters on a conference call, "I think people are really frustrated with some of the big price tags that are coming out from programs even in addition to this one, so we're going to look for areas where we can keep costs down and look for ways where we can save money."

In a statement responding to President-elect Trump's tweet, Boeing said, "We are currently under contract for $170 million to help determine the capabilities of these complex military aircraft that serve the unique requirements of the President of the United States. We look forward to working with the U.S. Air Force on subsequent phases of the program allowing us to deliver the best planes for the President at the best value for the American taxpayer."