I expect that Pres. Trump had a LOT of input into that speech. It sounds like him, not like words that were fed to him by a puppeteer (unlike some recent president I can think of). Whoever helped to write it or polished it did great.
I agree. No way Trump wrote that speech. Yes, he told them what he wanted to say and they polished it up.
Whoever the main speechwriter on that was did a fantastic job.