I had to look that word up - how random.
I could see someone with a conscience using that word in a brilliant move to cast suspicion on Pence and get Trump to consider throwing him out before I could see Pence writing that himself.
I'd be surprised if it's an actual big name. The letter reads to my brain like someone behind-the-scenes and probably with concerns leaning more to the financial side...McGahn, Ross, Mnuchin, someone like that.
But my heart wants it to be Kushner.
Poll here