Trump might want to toe the line instead of assuming that just because he’s President, he’s untouchable.
Yes, it’s rare for a President to get held to the Emoluments Clause. However, Trump needs to remember that there are a bunch of Republicans in Congress who would love to get Trump out of the way in favor of Pence. And they’ll take any excuse they can get — it won’t take much. And the Democrats aren’t going to save Trump.