Trump is a means to an end for the GOP. That is all. They aren't afraid of his base as they are not entirely the regular GOP base. I see them made up as follows;
Smart business people who sit idly by watching regulations fall so they can make a quick buck on deregulation of various things.
Vapid religious people who will grudgingly go for Donald the molester because he has done certain things for their food group.
Mouth breathing, zombie like, redneck idiots who would believe anything they were told because they are way too stupid to think for themselves.
Graham is aware of and is partially afraid of the first 2 groups... Not the last one.
One day to the next, a different stupid change in outlook on Everything. WTH is he?
Most likely Russia or Trump have photos of an illicit affair.