Is Qatar's $400 million gold-plated gifted jet to Trump illegal?

President Donald Trump is reportedly preparing to accept a $400 million Boeing 747-8 jumbo jet from the royal family of Qatar. The transaction has raised thorny questions about the rules surrounding foreign gifts to sitting presidents. Trump said that the jet is a gift to the Defense Department, and the administration was apparently planning to retrofit the jet to be used as Air Force One during his second term,