This is an interesting case - time for a quick reminder what’s at issue (short thread).
At issue is a possible breach of the so-called “emoluments” clause. There’s a foreign and a domestic one, both are involved. Here’s the Constitutional wording. 
The problem arises, of course, from Trump’s business interests. He has not divested completely - and the Trump Organization receives payments.
This is not the only case in that regard. Here’s a denial of a motion to dismiss (i.e. there’s a viable case) from the District of Maryland mdd.uscourts.gov/sites/mdd/file…
