Jimmy Kimmel has a theory: Trump brought on Giuliani to make himself look less crazy.
After giving several confusing and damaging interviews (see crazy eyes) where the new hire directly contradicted statements Trump made about the payment to Stormy Daniels. Trump even had to go on the defensive, saying that Giuliani is ‘new’ and ‘doesn’t know all the facts.’
See it here.
https://www.youtube.com/watch?v=vPj0qzPiMhA