Keep in mind that Trump is not exactly the darling of the Republican party. They did everything imaginable to try and keep him from winning the primaries. I think he is only polling at 70% within the party, and many of the party establishment say that they are not endorsing him. Even Bush Sr has come out and said he is voting for Hillary.
To me, this election is not D vs R, but more of like Establishment vs Outsider. Trump could have run as a candidate for either party, and there would be the same drumbeat as to how bad/evil/stupid he is.
Sorry to get off-topic. But yesterday I did a quick Yahoo search "What is Lester Holt's political affiliation". I use Yahoo for any politics-related searches. Trump is being bashed for saying Holt (who will moderate the debate) is a democrat. The Yahoo page still had cached Wikipedia text that says "According to voter registration records, he is a Democrat". So, I saved a screen snapshot. But when you follow the link to the Wiki page, that text is now gone. At the bottom of the page, it says Holt is a Republican. But they only cite two articles, created yesterday, that bash Trump's statement, and use that as reference rather than voter registration records. Over the last day, they altered reality to fit the story that Trump is stupid/wrong. And if anyone tries a quick "fact check", they will hit up Wikipedia, which now contains bogus information and a circular reference. No doubt that by now, other places like answers.com have also been "updated".