well, there is a pretty large (10-15%) libertarian leading contingent of the Republican party.
Also, people may not agree with all his stances, but are avidly against the IRS, gun protection, or border security, or some combination thereof and have such high priority on those issues they let the other stuff slide.
It’s been my experience that people that disagree with his domestic platforms, but like him for his foreign policy above all else, generally are not republicans.
Interestingly, there are some people who like him just on the character issue.
“Interestingly, there are some people who like him just on the character issue”
I’ll grant you that one, he is a character.