I think President Trump is trying to accomplish his (our) goals and is bringing in the best resources available whether or not he has clashed with them in the past.
A successful CEO knows that people with different experiences and views are needed on an executive team. If there is such a thing as an "enemy," it would be people who turn out to be dishonest or incompetent, and I'll bet he doesn't waste much time or energy on them (it's not productive).
Note that I'm talking about making the business go, a different thing than the need to quickly defend oneself from public personal attacks.
That's it, precisely. The very vain Bishop Romney got a courteously delivered public rejection; but Trump does appear to want to keep lines of communication open with as many proven talents as possible.