Seth Meyer made the point that Trump specifically said that one of his selling points as possible president is that he isn’t a plagiarist like Joe Biden. This event just showcases what a bumbler he is.
Also, I can’t help thinking that whatever speech writer is responsible for this is secretly gleeful. It just seems so odd they wouldn’t expect it to be caught. It’s one thing to plagiarize something obscure but this is a recent speech given by a member of the opposing party. It’s just ludicrous.