Either way it is a brilliant tactic. The perfect carrot to dangle to the folks who don't buy his recent "conversion".
I've actually heard it from both sides. Brilliant tactic for bringing in people that had (have) doubts about his conservative/constitutional creds, but might hurt him with the "anybody but Hillary" Dem and uncommitted voters, especially the berners.
As I've read things about the choices, I like them. Especially that they're all relatively young and would be there for a while. Of course a President Trump getting them vetted by not just Dems but by disgruntled GOPe will be some work.