Couldn't find one from that early, but I did find this clip from February 2023 (although he does say he's said this before!):

https://www.newsweek.com/donald-trump-n-word-viral-video-1782781

Nuclear is so devastating that we don't even want to talk about it, and that was a word that was never supposed to be mentioned, We have two n-words, neither of which should ever be mentioned. I said that once and they said 'oh what a terrible thing to say,' no. We have two n-words, you know what the one is but the other's the nuclear word, not supposed to ever be mentioned ever, ever, ever! It's mentioned every single day now.

Relevant Mulaney bit