Its fun witnessing Demographic Armageddon swallow whole the party of white nationalism. The thing is...the republican party is completely incapable of changing or adapting because at its core its full of old white people who continue to cling the outdated ideals that resemble that of the old traitorous confederacy. 

These old white folks were dragged kicking and screaming from the Jim Crow era into a post civil rights / voting rights America. They resented it then but for years it wasn't cool to make a lot of noise about it so they kind of kept a lid on it. Then Trump came along and released them from the bonds of their self-imposed "political correctness". 

In the end, Donald Trump isn't problem with the republican party. The problem is that the party is full of republicans. And with the terror of Demographic Armageddon looming to swallow them whole in the coming years, they think Trump is their last and only hope for a return to a white-dominated America.