Let's say, for sake of argument, Donald is elected President. How does he propose to force Mexico to pay for a border wall? He sounds like a little kid who says "If I'm President, I'll solve world hunger and bring world peace."
Like all blowhards, he says things that cause controversy and sound like good rhetoric to certain gullible people, but unless he's stupid (which he isn't) he knows that he's saying attention-grabbing nonsense as much as you or I know it.
I bet you said that no one can amass a $9 billion fortune either.