I think he might be able to.
Imagine this. A Trump DOJ, instead of promoting voting rights for felons and illegals, establishes a federal position on implementation of the 2A. No magazine limits, any semi-auto is OK no matter how "scary-looking, a right to buy ammo, and the position that preventing internet sales of ammo is an illegal restraint of interstate commerce.
Oh, yes, by the way, that "full faith and credit" clause means that every state must recognize CCW from any other state. And when the 2A says "keep and bear arms" that means exactly what it says. A state must allow either open or shall-issue concealed carry.
If your state does not measure up, DOJ will sue your AG in federal court...
See Albion Wilde’s post; there’s a website set up by President elect Trump where you can send in suggestions.
http://www.freerepublic.com/focus/bloggers/3492396/posts?page=143#143
The greatagain one.