I've never really understood Lindsey Graham's turn from being one of the "three Amigos" (Graham, McCain, & Lieberman) to MAGA Republican. How could someone count McCain as a personal friend and, at the same time, maintain close relations with someone like Trump?
In this chapter of Baker and Glasser's "The Divider", the authors explain how Graham's switch was the result of his desire to--in a word--remain "relevant".
Still, Trump has never believed Graham is entirely on his side, hence his use of the term "Eighty-five Percenter".