Seeing as how Romney was among the most outspoken in his opposition to Trump yet visited Trump twice after the election, I think any enemies list is more "fake news"..........(Nixon not withstanding).....
Casey
Trump was just having a good time rubbing Romney's nose in it.
Here's some good commentary on the matter from Vox Popoli.
http://voxday.blogspot.com/2017/01/pity-poor-never-trumpers.html#comment-form