He is a fantastic speaker, no notes, and has spoken at several Republican events supporting Trump. You should have heard him when he was promoting Brexit and he told the EU assembly to essentially, pound sand.
That is a gift they both share. No notes, maybe a standard stumping set of points, but they can do it for an hour or more, and totally engage their audience, interacting, coming up with new jokes off the cuff, and then back to the set of points. It’s truly a wonder to behold.