I believe the one person that can best fill his shoes is Fred Thompson. It’s a tall order to be sure but no one else the GOP can put up even comes close.
I like Duncan Hunter, but I know realistically that Thompson is the only acceptable candidate who can win.
There are two Reagan sons - the oldest one’s an adoptee (NOT his namesake) and wrote the article. The other one, well....
You said “best”, so I do think you realize that’s an almost impossible standard for anyone else to meet.
But FDT’s a good start.