The power of the desire to believe is on full display here. Something that has been debunked by every single group looking into it, and yet still some believe it simply because they want to. Gullibility is not a virtue by the way.
No one knows how much this is going to cost and the real problem is the message it sends to the American people. He is acting like a king and in the face of the disastrous election on Tuesday this is not the time for the President to take a trip like this and not tell the people how much it is going to cost.