Qatar-gifted Air Force One replacement unveiled

US President Donald Trump unveiled on Friday a replacement Air Force One aircraft gifted by Qatar, which he dubbed a "flying White House.""This is considered the world's most luxurious plane," Trump said at a speech inside the plane's hangar, praising the gulf emirate for being "so nice and providing" it.Qatar's gift of the aircraft -- valued in the hundreds of millions of dollars -- has raised ethical, constitutional and security concerns.