Some people read scripts flawlessly; others do better with an general outline and a few hard-to-remember facts and figures. But going without a visual all the time all but guarantees mistakes or omissions at some point.
[But going without a visual all the time all but guarantees mistakes...]
I agree but I hope he has the script of his speeches handy at the podium and follows along by flipping page by page to keep in sync with the teleprompter just in case it fails.