No, I can't explain why Trump believes double jeopardy comes into play here.

The man is not Jesus Christ. He's not infallible. He's not a lawyer. And to be blunt, if you look at the people he's hired or had appointed, he's not the best judge of character or intellect. Cohen, Bannon, Sessions, Pence, Bolton, and many others I can't recall at the moment.

On one hand, we have a specific clause in the Constitution that clearly says that double jeopardy doesn't apply to Impeachment decisions.

On the other hand, we have a human being that is not versed in constitutional law, who is a master of the spin, and who is facing being charged with some serious crimes.

Sometimes reality is a bitch and hard to face.