As much as I would love to see Trump buried in this election, I hope it's not the N-word. I can't imagine many things being worse though. Maybe Trump attends furry conventions or something. I dunno.
Keep in mind that he's talking to republicans, if republicans had anything, why didn't they use it in the primaries? This new stuff is all coming from democratic oppo dump and the clinton camp, which means they probably have no idea if there is anything else in the first place, let alone what it might be.