Trump says he'd be "stupid" to not accept the aircraft "free of charge", after Qatar denied it amounted to a gift.

The Trump administration is preparing to accept a superluxury Boeing 747-8 jumbo jet from the royal family of Qatar as a gift to be used by President Donald Trump as the new Air Force One for presidential travel until shortly before Trump leaves office, according to four sources familiar with the planning.

The Constitution bars federal officials from accepting gifts from foreign states without the consent of Congress.