President Donald Trump’s confirmation Sunday that the United States may accept a presidential aircraft gifted from Qatar marked the latest escalation in his clash with Boeing, which is years behind on its government contract to build the new Air Force One.

Taxpayers would likely foot the bill to retrofit President Trump's new jet, which could be more than twice the plane's $400 million value.

The nation of Qatar offered the Trump administration a Boeing 747-8 for use as Air Force One. Trump called the plane a "gift," in a post on his social media site, Truth Social. A representative of the administration clarified that Qatar "has offered to donate a plane to the Department of Defense," not to Trump himself.