The topic here is why Rudy Giuliani is not (so far) on Donald Trump's legal team for the impeachment trial. Mr. Giuliani is probably right — and how often do any of us say that? — when he explains, "I am a potential fact witness. I think very potential but still leaves you unable to appear." But isn't the real reason that it's easier for your legal team to throw someone under the proverbial bus when that person isn't on your legal team?